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