头孢氨苄

4-nitrobenzyl (6R,7S)-3-methyl-7-methylthio-7-(4-nitrobenzylidene)aminoceph-3-em-4-carboxylate

(6R)-7t-benzylideneamino-3,7c-dimethyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid tert-butyl ester

(6R)-3,7c-dimethyl-8-oxo-7t-(2-phenoxy-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid

3-Methyl-8-oxo-7-(2-phenoxy-acetylamino)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid allyl ester