(6R)-7t-((R)-5-amino-5-carboxy-pentanoylamino)-3-benzoylsulfanylmethyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
7-Aminocephalosporanic acid
(6R)-3-acetoxymethyl-7t-((R)-5-benzyloxycarbonyl-5-tert-butoxycarbonylamino-pentanoylamino)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzyl ester
(6R)-3-acetoxymethyl-7t-((R)-5-amino-5-benzyloxycarbonyl-pentanoylamino)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzyl ester
(6R)-3-acetoxymethyl-7t-amino-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-3-ene-2ξ-carboxylic acid benzhydryl ester