benzhydryl 7-[(Z)-(methoxycarbonyl)methylidene]cephalosporanate

(R)-3-Acetoxymethyl-7-dichloromethylene-5,5,8-trioxo-5λ6-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester

diphenylmethyl p-nitrobenzyl 7-[N-(p-nitrobenzyloxycarbonyl)glycyl-L-α-aminopimelyl]aminocephalosporanate

7β-<(Z)-2-(2-tert-butoxycarbonylaminothiazol-4-yl)-2-pentenoylamino>-3-acetoxymethyl-3-cephem-4-carboxylic acid

p-nitrobenzyl 7-[N-(p-nitrobenzyloxycarbonyl)glycyl-L-α-aminopimelyl]aminocephalosporanic acid