(6R)-3-acetoxymethyl-8-oxo-7t-(2-phenyl-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-3-ene-2ξ-carboxylic acid
cefaloram
7-(2-phenylacetamido)-3-hydroxymethyl-2-cephem-4-carboxylic acid
7-aminocephalosporanic acid
7-Phenylacetamido-3-(1-chlorethenyl)-3-cephem-4-carbonsaeure-benzhydrylester-1-oxid