InChI=1/C17H17NO3/c1-21-15(19)14-10-6-8-11(9-7-10)17(14)12-4-2-3-5-13(12)18-16(17)20/h2-6,8,10-11,14H,7,9H2,1H3,(H,18,20 methyl 2'-oxo-1',2'-dihydrospiro[bicyclo[2.2.2]oct-5-ene-2,3'-indole]-3-carboxylate spiro[bicyclo[2.2.2]oct-5-ene-2,3'-[3H]indole]-3-carboxylic acid, 1',2'-dihydro-2'-oxo-, methyl ester