(S)-2-((S)-9-Carboxymethyl-8-oxo-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-ylamino)-4-cyclohexyl-butyric acid ethoxycarbonylmethyl ester; hydrochloride

(S)-2-((S)-9-tert-Butoxycarbonylmethyl-8-oxo-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-ylamino)-4-cyclohexyl-butyric acid butyl ester

tert-butyl (S)-3-<(R)-1-ethoxycarbonyl-ω-phtalimidoheptyl>amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate

tert-butyl (S)-3-<(S)-1-ethoxycarbonyl-ω-phtalimidoheptyl>amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate

tert-butyl (S)-3-<(R)-1-ethoxycarbonyl-ω-phtalimidononyl>amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate