1ξ-oxo-6β-(2-phenyl-acetylamino)-1λ4-penicillanic acid 4-nitro-benzyl ester
1ξ-oxo-6β-diethoxyphosphorylamino-1λ4-penicillanic acid 4-nitro-benzyl ester
(6R)-7t-(2-carboxy-benzoylamino)-3-methyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-nitro-benzyl ester
(6R)-3-methyl-8-oxo-7t-phthalimido-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-nitro-benzyl ester
(6R)-7t-amino-3-methylene-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]octane-2ξ-carboxylic acid 4-nitro-benzyl ester; hydrochloride
p-nitrobenzyl 7-(1H-2-benzopyran-1-onyl-4-carboxamido)-3-methylceph-3-eme-4-carboxylate
(6R,7R)-7-((S)-2-tert-Butoxycarbonylamino-4-methyl-pentanoylamino)-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-nitro-benzyl ester
(S)-2-{[(6R,7R)-7-((S)-2-tert-Butoxycarbonylamino-4-methyl-pentanoylamino)-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carbonyl]-amino}-3-phenyl-propionic acid tert-butyl ester
(S)-2-{[(6R,7R)-7-((S)-2-tert-Butoxycarbonylamino-3-phenyl-propionylamino)-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carbonyl]-amino}-4-methyl-pentanoic acid tert-butyl ester
(S)-2-{[(6R,7R)-7-((S)-2-Amino-4-methyl-pentanoylamino)-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carbonyl]-amino}-3-phenyl-propionic acid