benzhydryl 7-oxocephalosporanate
(triphenylphosphoranylidene)acetaldehyde
(R)-3-acetoxymethyl-8-oxo-7-p-tolylsulfanylimino-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R)-3-acetoxymethyl-7t-amino-8-oxo-7c-p-tolylsulfanyl-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R)-3-acetoxymethyl-7t-(2-hydroxy-ethyl)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R)-3-acetoxymethyl-7c-(2-hydroxy-ethyl)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(R)-3-acetoxymethyl-7-((E)-2-hydroxy-ethylidene)-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(R)-3-acetoxymethyl-7-((Z)-2-hydroxy-ethylidene)-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R)-3-acetoxymethyl-8-oxo-7t-(2-oxo-ethyl)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester