7-Amino-3-desacetoxycephalosporanic acid sulfoxide

(6R,7R)-7-(2-Amino-2-benzo[1,3]dioxol-4-yl-acetylamino)-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid

7-<α-methoxyimino-α-(5-chloro-2-benzothienyl)acetamido>-3-methyl-3-cephem-4-carboxylic acid

tert-butyl 7α-chloro-3-bromomethyl-3-cephem-4-thiolcarboxylate 1,1-dioxide

7-<α-methoxyimino-α-(8-chloro-2-naphthyl)acetamido>-3-methyl-3-cephem-4-carboxylic acid