(+)-3,4-Didehydrocoronaridine 2468-21-5 Catharanthin Catharanthine EINECS 219-586-6 Ibogamine-18-carboxylic acid, 3,4-didehydro-, methyl ester, (2-alpha,5-beta,6-alpha,18-beta)- Methyl (2-alpha,5-beta,6-alpha,18-beta)-3,4-didehydroibogamine-18-carboxylate Methyl (2alpha,5beta,6alpha)-3,4-didehydroibogamine-18beta-carboxylate