<SEC-DOCUMENT>0001140361-17-012191.txt : 20170315
<SEC-HEADER>0001140361-17-012191.hdr.sgml : 20170315
<ACCEPTANCE-DATETIME>20170315201706
ACCESSION NUMBER:		0001140361-17-012191
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		7
CONFORMED PERIOD OF REPORT:	20170313
FILED AS OF DATE:		20170315
DATE AS OF CHANGE:		20170315

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MDC PARTNERS INC
		CENTRAL INDEX KEY:			0000876883
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ADVERTISING AGENCIES [7311]
		IRS NUMBER:				980364441
		STATE OF INCORPORATION:			A6
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		745 FIFTH AVENUE, 19TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10151
		BUSINESS PHONE:		646 429 1800

	MAIL ADDRESS:	
		STREET 1:		745 FIFTH AVENUE, 19TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10151

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MDC CORP INC
		DATE OF NAME CHANGE:	20001204

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MDC COMMUNICATIONS CORP
		DATE OF NAME CHANGE:	19961028

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MDC CORPORATION
		DATE OF NAME CHANGE:	19950419

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Bridge Street Opportunity Advisors, L.L.C.
		CENTRAL INDEX KEY:			0001615636

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		17692675

	BUSINESS ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282
		BUSINESS PHONE:		2129021000

	MAIL ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			StoneBridge 2017 Offshore, L.P.
		CENTRAL INDEX KEY:			0001698770
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		17692676

	BUSINESS ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282-2198
		BUSINESS PHONE:		212-902-1000

	MAIL ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282-2198

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			StoneBridge 2017, L.P.
		CENTRAL INDEX KEY:			0001698772
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		17692677

	BUSINESS ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282-2198
		BUSINESS PHONE:		212-902-1000

	MAIL ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282-2198

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Broad Street Principal Investments, L.L.C.
		CENTRAL INDEX KEY:			0001575993

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		17692678

	BUSINESS ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282
		BUSINESS PHONE:		2129021000

	MAIL ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GOLDMAN SACHS & CO
		CENTRAL INDEX KEY:			0000769993
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1127

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		17692679

	BUSINESS ADDRESS:	
		STREET 1:		200 WEST STREET
		STREET 2:		C/O GOLDMAN SACHS & CO
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282
		BUSINESS PHONE:		2129021000

	MAIL ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GOLDMAN SACHS GROUP INC
		CENTRAL INDEX KEY:			0000886982
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		17692680

	BUSINESS ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282
		BUSINESS PHONE:		2129021000

	MAIL ADDRESS:	
		STREET 1:		200 WEST STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282

	FORMER NAME:	
		FORMER CONFORMED NAME:	GOLDMAN SACHS GROUP INC/
		DATE OF NAME CHANGE:	20010104
</SEC-HEADER>
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    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2017-03-13</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000876883</issuerCik>
        <issuerName>MDC PARTNERS INC</issuerName>
        <issuerTradingSymbol>MDCA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000886982</rptOwnerCik>
            <rptOwnerName>GOLDMAN SACHS GROUP INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 WEST STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000769993</rptOwnerCik>
            <rptOwnerName>GOLDMAN SACHS &amp; CO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 WEST STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001575993</rptOwnerCik>
            <rptOwnerName>Broad Street Principal Investments, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 WEST STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001698772</rptOwnerCik>
            <rptOwnerName>StoneBridge 2017, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 WEST STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282-2198</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001698770</rptOwnerCik>
            <rptOwnerName>StoneBridge 2017 Offshore, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 WEST STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282-2198</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001615636</rptOwnerCik>
            <rptOwnerName>Bridge Street Opportunity Advisors, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 WEST STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Subordinate Voting Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9500000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series 4 Preference Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Subordinate Voting Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9500000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This statement is being filed by The Goldman Sachs Group, Inc. (&quot;GS Group&quot;), Goldman, Sachs &amp; Co. (&quot;Goldman Sachs&quot;), Broad Street Principal Investments, L.L.C. (&quot;BSPI&quot;), StoneBridge 2017, L.P. (&quot;SB Employee Fund&quot;), StoneBridge 2017 Offshore, L.P. (&quot;SB Employee Fund Offshore,&quot; and together with SB Employee Fund, the &quot;Employee Funds&quot;) and Bridge Street Opportunity Advisors, L.L.C (&quot;Bridge Street&quot;).</footnote>
        <footnote id="F2">Goldman Sachs is a subsidiary of GS Group. Goldman Sachs is the manager of BSPI and Bridge Street and the investment manager of the Employee Funds.  GS Group is the direct owner of Bridge Street.  Bridge Street is the general partner of each Employee Fund.</footnote>
        <footnote id="F3">On February 14, 2017 the Issuer and BSPI entered into a Securities Purchase Agreement (as amended from time to time, the &quot;Purchase Agreement&quot;), pursuant to which the Issuer agreed to issue and BSPI agreed to purchase (the &quot;Private Placement&quot;) 95,000 Series 4 Convertible Preference Shares of the Issuer (the &quot;Preference Shares&quot;) for a cash purchase price of $1,000.00 per share, with an aggregate purchase price of $95,000,000 (the &quot;Purchase Price&quot;).</footnote>
        <footnote id="F4">On March 6, 2017 BSPI assigned its right to purchase 11,813 and 4,187 Preference Shares of the Issuer to SB Employee Fund and SB Employee Fund Offshore, respectively, pursuant to two Assignment and Assumption Agreements.</footnote>
        <footnote id="F5">In connection with the closing of the Private Placement, on March 13, 2017 GS Group filed a notification and report form and related materials under the Hart-Scott Rodino Antitrust Improvements Act of 1976, as amended (the &quot;HSR Act&quot;) with the United States Federal Trade Commission and the Antitrust Division of the United States Department of Justice. Upon the earlier of (i) the receipt of early termination under the HSR Act or (ii) the expiration of all waiting periods under the HSR Act (such date the &quot;Precedent Date&quot;), which is expected to occur within thirty days after such filing, BSPI and the Employee Funds shall have the right to convert the Preference Shares into Class A Subordinate Voting Shares of the Issuer (the &quot;Class A Shares&quot;) in whole at any time and from time to time, and in part at any time and from time to time after the ninetieth day following the original issuance date of the Preference Shares, subject to certain ownership limitations.</footnote>
        <footnote id="F6">Following the Precedent Date, because of the relationship by and between GS Group, Goldman Sachs, BSPI and the Employee Funds, GS Group and Goldman Sachs may be deemed (for purposes of Rule 13d-3(a) and Rule 16a-1(a) only and not for any other applicable purpose) to beneficially own an aggregate of 134,471 Class A Shares, consisting of (i) 79,000 Class A Shares (deliverable to BSPI upon conversion of the Preference Shares directly held by BSPI), (ii) 16,000 Class A Shares (deliverable to the Employee Funds upon conversion of the Preference Shares directly held by the Employee Funds), and (iii) Goldman Sachs beneficially owns directly and GS Group may be deemed to beneficially own indirectly 39,471 shares of Class A Common Stock and Goldman Sachs also had open short positions of 127,396 shares of Class A Common Stock.  Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein, if any.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Yvette Kosic, Attorney-in-fact</signatureName>
        <signatureDate>2017-03-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Yvette Kosic, Attorney-in-fact</signatureName>
        <signatureDate>2017-03-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Yvette Kosic, Attorney-in-fact</signatureName>
        <signatureDate>2017-03-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Yvette Kosic, Attorney-in-fact</signatureName>
        <signatureDate>2017-03-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Yvette Kosic, Attorney-in-fact</signatureName>
        <signatureDate>2017-03-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Yvette Kosic, Attorney-in-fact</signatureName>
        <signatureDate>2017-03-15</signatureDate>
    </ownerSignature>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: right">EXHIBIT 24.0</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">POWER OF ATTORNEY</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">KNOW ALL PERSONS BY THESE PRESENTS that THE GOLDMAN SACHS GROUP, INC. (the &#8220;Company&#8221;) does hereby make, constitute and appoint each of Bruce A. Albert, Andrea DeMar, Yvette Kosic, Rachel Parrish, Kevin P. Treanor, Michael T. Seeley and Anthony DeRose (and any other employee of The Goldman Sachs Group,&#160;Inc. or one of its affiliates designated in writing by one of the attorneys-in-fact), acting individually, its true and lawful attorney, to execute and deliver in its name and on its behalf whether the Company is acting individually or as representative of others, any and all filings required to be made by the Company under the Securities Exchange Act of 1934, (as amended, the &#8220;Act&#8221;), with respect to securities which may be deemed to be beneficially owned by the Company under the Act, giving and granting unto each said attorney-in-fact power and authority to act in the premises as fully and to all intents and purposes as the Company might or could do if personally present by one of its authorized signatories, hereby ratifying and confirming all that said attorney-in-fact shall lawfully do or cause to be done by virtue hereof.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">THIS POWER OF ATTORNEY shall remain in full force and effect until either revoked in writing by the undersigned or until such time as the person or persons to whom power of attorney has been hereby granted cease(s)&#160;to be an employee of The Goldman Sachs Group,&#160;Inc. or one of its affiliates.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">IN WITNESS WHEREOF, the undersigned has duly subscribed these presents as of October&#160;6, 2008.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>

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<table id="ze19df6caacb143219b27539b47c14c95" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; WIDTH: 100%; BORDER-COLLAPSE: separate" cellspacing="0" cellpadding="0" border="0">
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left"><strong><font style="FONT-WEIGHT: normal">THE GOLDMAN</font> <font style="FONT-WEIGHT: normal">SACHS GROUP, INC.</font></strong></div>
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<div style="TEXT-ALIGN: left; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">By: </div>
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<td style="WIDTH: 35%; BORDER-BOTTOM: #000000 2px solid" valign="top" nowrap="nowrap" align="left">/s/&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-VARIANT: normal; FONT-WEIGHT: normal; FONT-STYLE: normal">Gregory K. Palm</font></td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Gregory K. Palm</div>
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<td style="WIDTH: 3%" valign="top">Title:&#160;</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Executive Vice President and General Counsel</div>
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<DOCUMENT>
<TYPE>EX-24.1
<SEQUENCE>3
<FILENAME>mdcex24_1.htm
<TEXT>
<html>
<head>
<title></title>
<!--Licensed to: Fried, Frank, Harris, Shriver & Jacobson LLP
    Document created using EDGARfilings PROfile 4.2.1.0
    Copyright 1995 - 2017 Summit Financial Printing, LLC.  All rights reserved.-->
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<body style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif" bgcolor="#ffffff" text="#000000">
<div><br />
&#160;</div>

<div>&#160;</div>

<div>
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: right">EXHIBIT 24.1</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">POWER OF ATTORNEY</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">KNOW ALL PERSONS BY THESE PRESENTS that <strong style="FONT-WEIGHT: normal">GOLDMAN, SACHS &amp; CO.</strong> (the &#8220;Company&#8221;) does hereby make, constitute and appoint each of Bruce A. Albert, Andrea DeMar, Yvette Kosic, Rachel Parrish, Kevin P. Treanor, Michael T. Seeley and Anthony DeRose (and any other employee of The Goldman Sachs Group,&#160;Inc. or one of its affiliates designated in writing by one of the attorneys-in-fact), acting individually, its true and lawful attorney, to execute and deliver in its name and on its behalf whether the Company is acting individually or as representative of others, any and all filings required to be made by the Company under the Securities Exchange Act of 1934, (as amended, the &#8220;Act&#8221;), with respect to securities which may be deemed to be beneficially owned by the Company under the Act, giving and granting unto each said attorney-in-fact power and authority to act in the premises as fully and to all intents and purposes as the Company might or could do if personally present by one of its authorized signatories, hereby ratifying and confirming all that said attorney-in-fact shall lawfully do or cause to be done by virtue hereof.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">THIS POWER OF ATTORNEY shall remain in full force and effect until either revoked in writing by the undersigned or until such time as the person or persons to whom power of attorney has been hereby granted cease(s)&#160;to be an employee of The Goldman Sachs Group,&#160;Inc. or one of its affiliates.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">IN WITNESS WHEREOF, the undersigned has duly subscribed these presents as of October&#160;6, 2008.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">
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<tr style="HEIGHT: 12px">
<td style="WIDTH: 50%" valign="top">&#160;</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left"><strong style="FONT-WEIGHT: normal">GOLDMAN, SACHS &amp; CO.</strong></div>
</td>
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<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">&#160;</td>
<td style="WIDTH: 35%" valign="top">&#160;</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
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<tr>
<td style="WIDTH: 50%; PADDING-BOTTOM: 2px" valign="top" align="left">
<div style="TEXT-ALIGN: left; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;</div>
</td>
<td style="WIDTH: 3%; PADDING-BOTTOM: 2px" valign="top">
<div style="TEXT-ALIGN: left; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">By: </div>
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<td style="WIDTH: 35%; BORDER-BOTTOM: #000000 2px solid" valign="top" nowrap="nowrap" align="left">/s/&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-VARIANT: normal; FONT-WEIGHT: normal; FONT-STYLE: normal">Gregory K. Palm</font></td>
<td style="WIDTH: 12%; PADDING-BOTTOM: 2px" valign="top">&#160;</td>
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<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Gregory K. Palm</div>
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</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">Title:&#160;</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Executive Vice President and General Counsel</div>
</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">&#160;</td>
<td style="WIDTH: 35%" valign="top">&#160;</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>
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</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify"><br />
&#160;</div>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.2
<SEQUENCE>4
<FILENAME>mdcex24_2.htm
<TEXT>
<html>
<head>
<title></title>
<!--Licensed to: Fried, Frank, Harris, Shriver & Jacobson LLP
    Document created using EDGARfilings PROfile 4.2.1.0
    Copyright 1995 - 2017 Summit Financial Printing, LLC.  All rights reserved.-->
</head>
<body style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif" bgcolor="#ffffff" text="#000000">
<div>&#160;</div>

<div>&#160;</div>

<div>&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: right">EXHIBIT 24.2</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">POWER OF ATTORNEY</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">KNOW ALL PERSONS BY THESE PRESENTS that BROAD STREET PRINCIPAL INVESTMENTS, L.L.C. (the &#8220;Company&#8221;) does hereby make, constitute and appoint each of Bruce A. Albert, Anthony DeRose, Yvette Kosic, Kevin P. Treanor and Amber Derryberry (and any other employee of The Goldman Sachs Group,&#160;Inc. or one of its affiliates designated in writing by Bruce Albert or Yvette Kosic), acting individually, as its true and lawful attorney, to approve, execute and deliver in its name and on its behalf, whether the Company is acting individually or as representative of others, any and all filings required to be made by the Company under the Securities Exchange Act of 1934, (as amended, the &#8220;Act&#8221;), with respect to securities which may be deemed to be beneficially owned by the Company under the Act, giving and granting unto each said Attorney-in-fact power and authority to act in the premises as fully and to all intents and purposes as the Company might or could do, hereby ratifying and confirming all that said Attorney-in-fact shall lawfully do or cause to be done by virtue hereof.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">THIS POWER OF ATTORNEY shall remain in full force and effect until either revoked in writing by the undersigned or until such time as the person or person to whom power of attorney has been hereby granted ceases to be an employee of The Goldman Sachs Group,&#160;Inc. or one of its affiliates or ceases to perform the function in connection with which he/she was appointed Attorney-in-fact. This Power of Attorney shall cease to have effect in relation to such Attorney-in-fact upon such cessation but shall continue in full force and effect in relation to the remaining Attorneys-in-fact. The Company has the unrestricted right unilaterally to revoke this Power of Attorney.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">THIS POWER OF ATTORNEY shall be governed by, and construed in accordance with, the laws of the State of New York, without regard to rules&#160;of conflicts of law.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">IN WITNESS WHEREOF, the undersigned has duly subscribed these presents this 1st day of March, 2017.</div>

<div>
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">
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<tr style="HEIGHT: 12px">
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 38%; FONT-WEIGHT: normal" valign="top" colspan="2">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left"><strong style="FONT-WEIGHT: normal">BROAD STREET PRINCIPAL INVESTMENTS, L.L.C.</strong></div>
</div>
</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">&#160;</td>
<td style="WIDTH: 35%" valign="top">&#160;</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%; PADDING-BOTTOM: 2px" valign="top" align="left">
<div style="TEXT-ALIGN: left; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;</div>
</td>
<td style="WIDTH: 3%; PADDING-BOTTOM: 2px" valign="top">
<div style="TEXT-ALIGN: left; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">By: </div>
</td>
<td style="WIDTH: 35%; BORDER-BOTTOM: #000000 2px solid" valign="top" nowrap="nowrap" align="left">/s/&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-VARIANT: normal; FONT-WEIGHT: normal; FONT-STYLE: normal">William Y. Eng</font></td>
<td style="WIDTH: 12%; PADDING-BOTTOM: 2px" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">Name:</td>
<td style="WIDTH: 35%" valign="bottom" nowrap="nowrap" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">William Y. Eng</div>
</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">Title:&#160;</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Vice President</div>
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<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">&#160;</td>
<td style="WIDTH: 35%" valign="top">&#160;</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>
</table>
</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify"><br />
&#160;</div>
</div>

<div>&#160;</div>

<div><br />
</div>
</body>
</html>

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.3
<SEQUENCE>5
<FILENAME>mdcex24_3.htm
<TEXT>
<html>
<head>
<title></title>
<!--Licensed to: Fried, Frank, Harris, Shriver & Jacobson LLP
    Document created using EDGARfilings PROfile 4.2.1.0
    Copyright 1995 - 2017 Summit Financial Printing, LLC.  All rights reserved.-->
</head>
<body style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif" bgcolor="#ffffff" text="#000000">
<div>&#160;</div>

<div>&#160;</div>

<div>&#160;</div>

<div>
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: right">EXHIBIT 24.3</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">POWER OF ATTORNEY</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">KNOW ALL PERSONS BY THESE PRESENTS that STONEBRIDGE 2017, L.P. (the &#8220;Company&#8221;) does hereby make, constitute and appoint each of Yvette Kosic, Kevin P. Treanor and Kimberly Williams (and any other employee of The Goldman Sachs Group, Inc. or one of its affiliates designated in writing by Yvette Kosic), acting individually, as its true and lawful attorney, to approve, execute and deliver in its name and on its behalf, whether the Company is acting individually or as representative of others, any and all filings required to be made by the Company under the Securities Exchange Act of 1934, (as amended, the &#8220;Act&#8221;), with respect to securities which may be deemed to be beneficially owned by the Company under the Act, &#160;giving and &#160;granting &#160;unto each said Attorney-in-fact power and authority to act in the premises as fully and to all intents and purposes as the Company might or could do, hereby ratifying and confirming all that said Attorney-in-fact shall lawfully do or cause to be done by virtue hereof.</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">THIS POWER OF ATTORNEY shall remain in full force and effect until either revoked in writing by the undersigned or until such time as the person or person to whom power of attorney has been hereby granted ceases to be an employee of The Goldman Sachs Group, Inc. or one of its affiliates or ceases to perform the function in connection with which he/she was appointed Attorney-in-fact. This Power of Attorney shall cease to have effect in relation to such Attorney-in-fact upon such cessation but shall continue in full force and effect in relation to the remaining Attorneys-in-fact. The Company has the unrestricted right unilaterally to revoke this Power of Attorney.</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">THIS POWER OF ATTORNEY shall be governed by, and construed in accordance with, the laws of the State of New York, without regard to rules of conflicts of law.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">IN WITNESS WHEREOF, the undersigned has duly subscribed these presents this 1st day of March, 2017.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">
<table id="z356d133136384742b331f99e7dafbc24" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; WIDTH: 100%; BORDER-COLLAPSE: separate" cellspacing="0" cellpadding="0" border="0">
<tr style="HEIGHT: 12px">
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 38%; FONT-WEIGHT: normal" valign="top" colspan="2">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left"><strong style="FONT-WEIGHT: normal">STONEBRIDGE 2017, L.P.</strong></div>
</div>
</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">&#160;</td>
<td style="WIDTH: 35%" valign="top">&#160;</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr style="HEIGHT: 18px">
<td style="WIDTH: 50%" valign="top" align="left">&#160;</td>
<td style="WIDTH: 3%" valign="top">By:</td>
<td style="WIDTH: 35%" valign="top" nowrap="nowrap" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Bridge Street Opportunity Advisors, L.L.C.,</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">its General Partner</div>
</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top" align="left">&#160;</td>
<td style="WIDTH: 3%" valign="top">&#160;</td>
<td style="WIDTH: 35%" valign="top" nowrap="nowrap" align="left">&#160;</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%; PADDING-BOTTOM: 2px" valign="top" align="left">
<div style="TEXT-ALIGN: left; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">&#160;</div>
</td>
<td style="WIDTH: 3%; PADDING-BOTTOM: 2px" valign="top">
<div style="TEXT-ALIGN: left; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt; TEXT-INDENT: 0pt">By: </div>
</td>
<td style="WIDTH: 35%; BORDER-BOTTOM: #000000 2px solid" valign="top" nowrap="nowrap" align="left">/s/&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; FONT-VARIANT: normal; FONT-WEIGHT: normal; FONT-STYLE: normal">William Y. Eng</font></td>
<td style="WIDTH: 12%; PADDING-BOTTOM: 2px" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">Name:</td>
<td style="WIDTH: 35%" valign="bottom" nowrap="nowrap" align="left">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">William Y. Eng</div>
</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">Title:&#160;</td>
<td style="WIDTH: 35%" valign="top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Vice President</div>
</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>

<tr>
<td style="WIDTH: 50%" valign="top">&#160;</td>
<td style="WIDTH: 3%" valign="top">&#160;</td>
<td style="WIDTH: 35%" valign="top">&#160;</td>
<td style="WIDTH: 12%" valign="top">&#160;</td>
</tr>
</table>
</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify"><br />
&#160;</div>
</div>
</body>
</html>

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.4
<SEQUENCE>6
<FILENAME>mdcex24_4.htm
<TEXT>
<html>
<head>
<title></title>
<!--Licensed to: Fried, Frank, Harris, Shriver & Jacobson LLP
    Document created using EDGARfilings PROfile 4.2.1.0
    Copyright 1995 - 2017 Summit Financial Printing, LLC.  All rights reserved.-->
</head>
<body style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif" bgcolor="#ffffff" text="#000000">
<div>&#160;</div>

<div>&#160;</div>

<div>&#160;</div>

<div>
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: right">EXHIBIT 24.4</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">POWER OF ATTORNEY</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">KNOW ALL PERSONS BY THESE PRESENTS that STONEBRIDGE 2017 OFFSHORE, L.P. (the &#8220;Company&#8221;) does hereby make, constitute and appoint each of Yvette Kosic, Kevin P. Treanor and Kimberly Williams (and any other employee of The Goldman Sachs Group, Inc. or one of its affiliates designated in writing by Yvette Kosic), acting individually, as its true and lawful attorney, to approve, execute and deliver in its name and on its behalf, whether the Company is acting individually or as representative of others, any and all filings required to be made by the Company under the Securities Exchange Act of 1934, (as amended, the &#8220;Act&#8221;), with respect to securities which may be deemed to be beneficially owned by the Company under the Act, &#160;giving and &#160;granting &#160;unto each said Attorney-in-fact power and authority to act in the premises as fully and to all intents and purposes as the Company might or could do, hereby ratifying and confirming all that said Attorney-in-fact shall lawfully do or cause to be done by virtue hereof.</div>

<div><br />
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">THIS POWER OF ATTORNEY shall remain in full force and effect until either revoked in writing by the undersigned or until such time as the person or person to whom power of attorney has been hereby granted ceases to be an employee of The Goldman Sachs Group, Inc. or one of its affiliates or ceases to perform the function in connection with which he/she was appointed Attorney-in-fact. This Power of Attorney shall cease to have effect in relation to such Attorney-in-fact upon such cessation but shall continue in full force and effect in relation to the remaining Attorneys-in-fact. The Company has the unrestricted right unilaterally to revoke this Power of Attorney.</div>

<div><br />
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">KNOW ALL PERSONS BY THESE PRESENTS that BRIDGE STREET OPPORTUNITY ADVISORS, L.L.C. (the &#8220;Company&#8221;) does hereby make, constitute and appoint each of Anthony DeRose, Yvette Kosic and Kevin P. Treanor (and any other employee of The Goldman Sachs Group, Inc. or one of its affiliates designated in writing by Anthony DeRose or Yvette Kosic), acting individually, as its true and lawful attorney, to approve, execute and deliver in its name and on its behalf, whether the Company is acting individually or as representative of others, any and all filings required to be made by the Company under the Securities Exchange Act of 1934, (as amended, the &#8220;Act&#8221;), with respect to securities which may be deemed to be beneficially owned by the Company under the Act, giving and granting unto each said Attorney-in-fact power and authority to act in the premises as fully and to all intents and purposes as the Company might or could do, hereby ratifying and confirming all that said Attorney-in-fact shall lawfully do or cause to be done by virtue hereof.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">THIS POWER OF ATTORNEY shall remain in full force and effect until either revoked in writing by the undersigned or until such time as the person or person to whom power of attorney has been hereby granted ceases to be an employee of The Goldman Sachs Group,&#160;Inc. or one of its affiliates or ceases to perform the function in connection with which he/she was appointed Attorney-in-fact. This Power of Attorney shall cease to have effect in relation to such Attorney-in-fact upon such cessation but shall continue in full force and effect in relation to the remaining Attorneys-in-fact. The Company has the unrestricted right unilaterally to revoke this Power of Attorney.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">THIS POWER OF ATTORNEY shall be governed by, and construed in accordance with, the laws of the State of New York, without regard to rules&#160;of conflicts of law.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">IN WITNESS WHEREOF, the undersigned has duly subscribed these presents this 1st day of March, 2017.</div>

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