(2R,4S)-2-[(1R)-1-{[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino}-2-oxoethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid
(2r,4s)-2-[(1r)-1-{[(2r)-2-amino-2-(4-hydroxyphenyl)acetyl]amino}-2-oxoethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid