(S)-2-[(2R,3R)-3-(4-Benzyloxy-phenyl)-2-tert-butoxycarbonylamino-3-hydroxy-propionylamino]-N-[bis-(4-methoxy-phenyl)-methyl]-succinamic acid methyl ester

(S)-N-[Bis-(4-methoxy-phenyl)-methyl]-2-[(2R,3R)-2-[(R)-2-(tert-butoxycarbonyl-methyl-amino)-4-methyl-pentanoylamino]-3-(tert-butyl-dimethyl-silanyloxy)-3-(4-hydroxy-phenyl)-propionylamino]-succinamic acid methyl ester

(2R,3R)-3-(4-Benzyloxy-phenyl)-2-[(R)-2-(tert-butoxycarbonyl-methyl-amino)-4-methyl-pentanoylamino]-3-hydroxy-propionic acid ethyl ester

(2R,3R)-3-(4-Benzyloxy-phenyl)-2-[(R)-2-(tert-butoxycarbonyl-methyl-amino)-4-methyl-pentanoylamino]-3-hydroxy-propionic acid