5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((2-(aminomethyl)phenyl)acetyl)amino)-8-oxo-3-((tetrazolo(1,5-b)pyridazin-6-ylthio)methyl)-, (6R-trans)- 52727-70-5 7-(o-Aminomethylphenylacetamido)-3-(tetrazolo(4,5-b)pyridazin-6-ylthiomethyl)-3-cephem-4-carboxylic acid BB-S 226 BB-S-226