CAS No:339528-86-8||Chemical Formula:C21H27N5O9S2||Molecular Weight:557.59300||Exact Mass:557.12502||(R)-1-((isopropoxycarbonyl)oxy)ethyl (6R,7R)-7-((Z)-2-(2-aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-(methoxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylate