Demethoxycefmetazole

7β-[[[(Cyanomethyl)thio]acetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]cepham-3-ene-4-carboxylic acid

(6R)-7α-[2-(Cyanomethylthio)acetylamino]-3-(1-methyl-1H-tetrazole-5-ylthiomethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]octa-2-ene-2-carboxylic acid