CAS No:N/A||Chemical Formula:C21H25N5O8S2||Molecular Weight:539.57800 ||Exact Mass:539.11445 ||(2S,5R,6R)-3,3-dimethyl-6-((S)-2-(3-(methylsulfonyl)-2-oxoimidazolidine-1-carboxamido)-2-phenylacetamido)-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid