4-27-00-09620 (Beilstein Handbook Reference) 427-01-0 BRN 0076217 Corynan-17-oic acid, 19,20-didehydro-16-((10-beta,13-beta,21-beta)-23-deoxy-21,22-dihydro-11-oxa-12,24-secostrychnidin-10-yl)-, methyl ester, (16R,19E)- Geissospermine