2,6-dioxa-4-azabicyclo[3.2.0]heptane-7-carboxylic acid, 4-acetyl-3,3,7-trimethyl-, methyl ester InChI=1/C11H17NO5/c1-6(13)12-8-7(16-10(12,2)3)11(4,17-8)9(14)15-5/h7-8H,1-5H methyl 4-acetyl-3,3,7-trimethyl-2,6-dioxa-4-azabicyclo[3.2.0]heptane-7-carboxylate