3-deacetyloxy-7-aminocephalosporanic acid
Chloromethyl pivalate
7-amino-3-methyl-3-cephem-4-carboxylic acid
(6R)-7t-[(Ξ)-2-acetoxy-2-(4-bromo-phenyl)-acetylamino]-3-methyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester
(6R)-7t-((Ξ)-2-acetoxy-2-phenyl-acetylamino)-3-methyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester