7-(2-aminomethylphenylacetamido)-3-(1-carboxymethyltetrazol-5-ylthiomethyl)-3-cephem-4-carboxylic acid.

The synthesis of 7-(2-aminomethylphenylacetamido)-(1-carboxymethyltetrazol-5-ylthiomethyl)-3-cephem-4-carboxylic acid (BL-S786) is described and the antimicrobial activities are compared with cefazolin and cefamandole. The compound exhibits broad antimicrobial spectrum, produces high intramuscular blood levels in mice and demonstrates a high degree of therapeutic efficacy in experimental bacterial infections in rodents.