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ACCRUED EXPENSES (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
ACCRUED EXPENSES [Abstract]    
Compensation payable $ 588,266 $ 293,534
Accrued general and administrative expenses 57,702 207,468
Accrued research and development expenses 349,592 399,893
Accrued interest 164,784 150,125
Total accrued expenses $ 1,160,344 $ 1,051,020