7-(1-Benzylpyridinium-4-yl)amino-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)ceph-3-em-4-carboxylate 77527-71-0 L 640876 L-640,876 Pyridinium, 4-((2-carboxy-3-(((1-methyl-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-en-7-yl)amino)-1-(phenylmethyl)-, inner salt, (6R-trans)-