3-((N-Methylpyridinium)-2-yl-methylthio)-6-(1-hydroxyethyl)-7-oxo-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylate 91615-54-2 Bmy 25174 Bmy-25174 Pyridinium, 2-(((2-carboxy-6-(1-hydroxyethyl)-7-oxo-1-azabicyclo(3.2.0)hept-2-en-3-yl)thio)methyl)-1-methyl-, hydroxide, inner salt, (5R-(5alpha,6alpha(R*)))-