7-mesyloxtacetamido-3-deacetoxycephalosporanic acid

4-nitrobenzyl (2'R,6R,7S)-hydroxy(phenyl)acetylamino-7-methylthio-3-methylceph-3-em-4-carboxylate

4-nitrobenzyl (6R,7S)-7-(2-hydroxybenzoylamino)-3-methyl-7-methylthioceph-3-em-4-carboxylate

sodium (R)-3-methyl-8-oxo-7-((p-tolylthio)imino)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

(6R)-7c-acetyl-3-methyl-8-oxo-7t-(2-phenoxy-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid