4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 3,3-dimethyl-7-oxo-6-[(phenoxyacetyl)amino]-, methyl ester, 4-oxide InChI=1/C17H20N2O6S/c1-17(2)13(16(22)24-3)19-14(21)12(15(19)26(17)23)18-11(20)9-25-10-7-5-4-6-8-10/h4-8,12-13,15H,9H2,1-3H3,(H,18,20 methyl 3,3-dimethyl-7-oxo-6-[(phenoxyacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4-oxide