99952-43-9 Carbamic acid, (2-(2-formyl-1-pyrrolidinyl)-2-oxoethyl)-, phenylmethyl ester, (S)- N-Benzyloxycarbonyl-glycyl-prolinal Phenylmethyl (S)-(2-(2-formyl-1-pyrrolidinyl)-2-oxoethyl)carbamate