InChI=1/C22H26N2O4/c1-4-13-12-24-10-9-15-14-7-5-6-8-17(14)23-20(15)18(24)11-16(13)19(21(25)27-2)22(26)28-3/h4-8,13,16,18-19,23H,1,9-12H2,2-3H methyl 17-methoxy-17-oxocoryn-18-en-16-carboxylate propanedioic acid, (3-ethenyl-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizin-2-yl)-, dimethyl ester