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

7-(phenoxyacetamido)deacetoxycephalosporanic acid 1β-oxide

(6R,7S)-2-(2,2-Dimethyl-propionyl)-7-ethyl-3-methyl-5,5-dioxo-7-phenylselanyl-5λ6-thia-1-aza-bicyclo[4.2.0]oct-2-en-8-one

7-<α-methoxyimino-α-(6-chloro-3-benzothienyl)acetamido>-3-methyl-3-cephem-4-carboxylic acid

7-tosyloxyacetamido-3-deacetoxycephalosporanic acid