InChI=1/C21H24N2O3/c1-12-16-10-23-8-7-14-13-5-3-4-6-18(13)22-20(14)19(23)9-15(16)17(11-26-12)21(24)25-2/h3-6,11-12,15-16,19,22H,7-10H2,1-2H methyl 19-methyl-16,17-didehydrooxayohimban-16-carboxylate oxayohimban-16-carboxylic acid, 16,17-didehydro-19-methyl-, methyl ester