(4R)-N-tert-butyl-3-[(2S,3S)-2-hydroxy-3-{[(3-hydroxy-2-methylphenyl)carbonyl]amino}-4-phenylbutanoyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxamide
(4r)-n-tert-butyl-3-[(2s,3s)-2-hydroxy-3-{[(3-hydroxy-2-methylphenyl)carbonyl]amino}-4-phenylbutanoyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxamide