(3S,4S)-1-<(3-methylbutyl)(benzyloxycarbonyl)amino>-3-hydroxy-4-<(tert-butoxycarbonyl)amino>-5-cyclohexylpentane

Boc-dl-(4-pyrimidinyl)Ala amide of (3S,4S)-1-<<(3-methylbutyl)carbonyl>amino>-3-hydroxy-4-amino-5-cyclohexylpentane

Boc-(π-N-methyl)His amide of (3S,4S)-1-<<(3-methylbutyl)carbonyl>amino>-3-hydroxy-4-amino-5-cyclohexylpentane

(2S,3S)-1-amino-2-hydroxy-3-<(tert-butyloxycarbonyl)amino>-4-cyclohexylbutane acetic acid salt

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