{(S)-1-[(S)-1-[(S)-1-((R)-2,2-Difluoro-1-hydroxy-2-{(1S,2S)-2-methyl-1-[(pyridin-2-ylmethyl)-carbamoyl]-butylcarbamoyl}-ethyl)-3-methyl-butylcarbamoyl]-2-(3H-imidazol-4-yl)-ethylcarbamoyl]-2-phenyl-ethyl}-carbamic acid tert-butyl ester

<4(S)-<amino>-2,2-difluoro-3(R)-hydroxy-6-methylheptanoyl>-L-isoleucyl-2-pyridylmethylamine

4(S)-amino-2,2-difluoro-3(R)-6-methylheptanoic acid, γ-lactam

methyl 5(S)-<<4(S)--2,2-difluoro-3(R)-hydroxy-6-methylheptanoyl>amino>-7-methyl-2(R)-(phenylmethyl)-3-trans-octenoate