4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-(acetylamino)-3,3-dimethyl-7-oxo-, methyl ester, 4-oxide InChI=1/C11H16N2O5S/c1-5(14)12-6-8(15)13-7(10(16)18-4)11(2,3)19(17)9(6)13/h6-7,9H,1-4H3,(H,12,14 methyl 6-(acetylamino)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4-oxide