1-pyrrolidinecarboxylic acid, 2-(2-oxa-3-azabicyclo[2.2.2]oct-5-en-3-ylcarbonyl)-, 1,1-dimethylethyl ester InChI=1/C16H24N2O4/c1-16(2,3)21-15(20)17-10-4-5-13(17)14(19)18-11-6-8-12(22-18)9-7-11/h6,8,11-13H,4-5,7,9-10H2,1-3H tert-butyl 2-(2-oxa-3-azabicyclo[2.2.2]oct-5-en-3-ylcarbonyl)pyrrolidine-1-carboxylate