1 0RM (2r,4s)-2-{(R)-carboxy[(2,6-dimethoxybenzoyl)amino]methyl}-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid 1.000 2 7EP (2r,4s)-2-[(1r)-1-{[(2,6-dimethoxyphenyl)carbonyl]amino}-2-oxoethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid 0.963 3 NFF (2r,4s)-2-[(1r)-1-{[(2-ethoxynaphthalen-1-yl)carbonyl]amino}-2-oxoethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid 0.750