The chemical Papain Inhibitor has a designated molecular formula of C19H29N7O6 and a molecular weight of 451.484 g/mol. Synonyms may include: Glycyl-glycyl-tyrosyl-arginine, GGYR, N2-(N-(N-Glycylglycyl)-L-tyrosyl)-L-arginine, Gly-gly-tyr-arg (ChemID).