The present invention relates to a novel therapeutically active derivative of 7-aminocephalosporanic acid which is 7-[1-(1H-4-nitroimidazolyl)acetyl]amino-3-[5-(1H-1-methyltetrazolyl)th io]methyl-3-cephem-4-carboxylic acid.
3-Desacetoxymethyl-3-{8 5{40 (1-methyltetrazolyl)thio{9 methyl-7-{8 1-(4-nitroimidazolyl)acetyl{9 aminocephalosporanic acid