{(S)-1-[(S)-1-[(1S,2S)-1-Cyclohexylmethyl-2-hydroxy-4-(4-methyl-pentanoylamino)-butylcarbamoyl]-2-(1-methyl-1H-imidazol-4-yl)-ethylcarbamoyl]-2-phenyl-ethyl}-carbamic acid tert-butyl ester

(3S,4S)-1-<<(2-methylpropyl)carbonyl>amino>-3-hydroxy-4-<(tert-butyloxycarbonyl)amino>-5-cyclohexylpentane

{(S)-1-[(S)-1-[(1S,2S)-1-Cyclohexylmethyl-2-hydroxy-4-(3-methyl-butyrylamino)-butylcarbamoyl]-2-(1H-imidazol-4-yl)-ethylcarbamoyl]-2-phenyl-ethyl}-carbamic acid tert-butyl ester

[(S)-1-((1S,2R)-1-Cyclohexylmethyl-3-cyclohexylsulfanyl-2-hydroxy-propylcarbamoyl)-2-(1H-imidazol-4-yl)-ethyl]-carbamic acid tert-butyl ester

{(S)-1-[(S)-1-[(1S,2S)-1-Cyclohexylmethyl-2-hydroxy-4-(4-methyl-pentanoylamino)-butylcarbamoyl]-2-(1H-imidazol-4-yl)-ethylcarbamoyl]-2-phenyl-ethyl}-carbamic acid tert-butyl ester