Phenyl-malonsaeure-mono-natriumsalz 、
7-amino-3-methylceph-3-em-4-carboxylic acid 以7-(α-Carboxyphenylacetamido)-3-methyl-3-cephem-4-carboxylic acid was afforded in a yield of 2.1 g (56%)的产率得到7-(alpha-Carboxyphenylacetamido)-3-methyl-3-cephem-4-carboxylic acid