CAS No:42540-40-9||Chemical Formula:C19H17N6NaO6S2||Molecular Weight: 512.49077||Exact Mass:512.05487||sodium (6R,7R)-7-((R)-2-(formyloxy)-2-phenylacetamido)-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate