Chemical Formula: C21H24N5NaO8S2,Exact Mass: 561.09640,Molecular Weight: 561.55977||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