1-(benzyloxy)-4(S)-<1(S)-<(tert-butoxycarbonyl)amino>-3-methylbutyl>-3,3-difluoro-2-azetidinone

sodium 4(S)-<(tert-butoxycarbonyl)amino>-2,2-difluoro-3(S)-<(4-methoxyphenyl)amino>-6-methylheptanoate

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

N-amino>-2,2-difluoro-3(S)-amino-6-methylheptanoyl>-L-isoleucyl>-2-pyridylmethylamine