{(R)-1-[(S)-1-((S)-1-{[(1S,2R)-1-Benzyl-2-(tert-butyl-dimethyl-silanyloxy)-4-oxo-butyl]-methyl-carbamoyl}-2-methyl-propylcarbamoyl)-ethyl]-octyl}-carbamic acid benzyl ester

(3R,4S)-4-{[(S)-2-((2S,3R)-3-Benzyloxycarbonylamino-2-methyl-decanoylamino)-3-methyl-butyryl]-methyl-amino}-3-(tert-butyl-dimethyl-silanyloxy)-5-phenyl-pentanoic acid