73547-61-2 Pyridinium, 1-(((6R,7R)-7-(((2Z)-(2-amino-4-thiazolyl)((1-carboxy-1-methylethoxy)imino)acetyl)amino)-2-carboxy-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)methyl)-, inner salt, monosodium salt