7-[O-(aminomethyl)phenylacetamido]-3-[[[1-(carboxymethyl)-1H-tetrazol-5-yl]thio]methyl]-3-cephem-4-carboxylic acid
7β-[2-(aminomethyl)phenyl]acetamido-3-{[1-(carboxymethyl)-1H-tetrazol-5-yl]sulfanyl}methyl-3,4-didehydrocepham-4-carboxylic acid