17,18-Secoyohimban-16-carboxylic acid, 16,17,18,19-tetradehydro-17-methoxy-, methyl ester, (E)- 18904-54-6 4-25-00-01255 (Beilstein Handbook Reference) 5986-06-1 63989-76-4 BRN 0096586 Corynantheine Hirsuteine