(R)-N-tert-butyl-3-[(2S,3S)-3-[(S)-2-(tert-butoxycarbonyl)aminopentanoyl]amino-2-hydroxy-4-phenylbutanoyl]-1,3-thiazolidine-4-carboxamide

3-({[(R)-3-((2S,3S)-3-tert-Butoxycarbonylamino-2-hydroxy-4-phenyl-butyryl)-5,5-dimethyl-thiazolidine-4-carbonyl]-amino}-methyl)-benzoic acid methyl ester

((1S,2S)-3-{(R)-4-[(Benzo[1,3]dioxol-5-ylmethyl)-carbamoyl]-5,5-dimethyl-thiazolidin-3-yl}-1-benzyl-2-hydroxy-3-oxo-propyl)-carbamic acid tert-butyl ester

4-({[(R)-3-((2S,3S)-3-tert-Butoxycarbonylamino-2-hydroxy-4-phenyl-butyryl)-5,5-dimethyl-thiazolidine-4-carbonyl]-amino}-methyl)-benzoic acid methyl ester

{(1S,2S)-1-Benzyl-2-hydroxy-3-[(R)-4-(2-methoxy-benzylcarbamoyl)-5,5-dimethyl-thiazolidin-3-yl]-3-oxo-propyl}-carbamic acid tert-butyl ester