CAS No:59798-30-0,42057-22-7,51481-65-3(Free Acid )||Chemical Formula:C21H24N5NaO8S2 ||Molecular Weight:561.55977||Exact Mass:561.09640 ||sodium (2S,5R,6R)-3,3-dimethyl-6-((R)-2-(3-(methylsulfonyl)-2-oxoimidazolidine-1-carboxamido)-2-phenylacetamido)-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate