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ACCRUED EXPENSES (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
ACCRUED EXPENSES [Abstract]    
Accrued compensation $ 385,935 $ 293,534
Accrued research and development expenses 631,563 207,468
Accrued general and administrative expenses 719,023 399,893
Accrued interest 179,605 150,125
Total accrued expenses $ 1,916,126 $ 1,051,020