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Products Chemical Name: β-Methyl vinyl phosphate (MAP)  Synonyms: 1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylicacid, 3-[(diphenoxyphosphinyl)oxy]-6-(1-hydroxyethyl)-4-methyl-7-oxo-,(4-nitrophenyl)methyl ester, [4R-[4a,5b,6b(R*)]]-  Cas No.: 90776-59-3  Molecular Formula: C29H27N2O10P  Molecular Weight: 594.51  Specification: 99%  Appearance: White powder  Usage: Penem antibacterial drugs backbone