CAS No:947692-13-9 ||Chemical Formula:C21H27N5O9S2 ||Molecular Weight:557.59300 ||Exact Mass:557.12502 ||(R)-1-((isopropoxycarbonyl)oxy)ethyl (6R,7R)-7-((E)-2-(2-aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-(methoxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate