(+/-)-1α-ethyl-1β-(2',2'-diethoxycarbonylethyl)-1,2,3,4,6,7,12,12bα-octahydro-indolo[2,3-a]quinolizine

(-)-1β-cyanomethyl-1α-ethyl-1,2,3,4,6,7,12,12bα-octahydro-indolo(2,3-a)quinolizine

(41S,13aS)-13a-ethyl-2-hydroxy-2,3,5,6,13,13a-hexahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridin-12(41H)-one

(3aS,3a1S,10bR)-5-chloro-3a-ethyl-5-nitro-2,3,3a,3a1,4,5,11,12-octahydro-1H-indolizino[8,1-cd]carbazole

1-(1,3-dithian-2-ylmethyl)-1-ethyl-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizine