5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-((((((aminoiminomethyl)amino)carbonyl)amino)phenylacetyl)amino)-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, (6R-(6alpha,7beta))- 58801-40-4 Cephalosporin 112883 Guanylureidocephalosporin