Synonyms: Corynan-16-carboxylicacid, 16,17-didehydro-9,17-dimethoxy-, methyl ester, (16E,20b)-; Corynantheidine, 9-methoxy-(7CI); Mitragynine (6CI); (-)-Mitragynine; 9-Methoxycorynantheidine;Indolo[2,3-a]quinolizine-2-acetic acid,3-ethyl-1,2,3,4,6,7,12,12b-octahydro-8-methoxy-a-(methoxymethylene)-, methyl ester, [2S-[2a(E),3a,12bb]]-; Mitragynin