3',4'-Dihydrousambarensine

(19E)-19,20-Didehydro-16-[4,9-dihydro-3H-pyrido[3,4-b]indol-1-yl]-17-norcorynan

(19E)-19,20-Didehydro-16-(3,4-dihydro-9H-pyrido[3,4-b]indole-1-yl)-17-norcorynan