(3aS,3a1S,10bR)-3a-ethyl-5-nitro-2,3,3a,3a1,4,6,11,12-octahydro-1H-indolizino[8,1-cd]carbazole

ent-18-oxo-eburnamonine

ethyl 2-((3aR,4S)-4-ethyl-4-(2-methoxy-2-oxoethyl)-6-oxo-3a,4,5,6-tetrahydro-1H-indolo[3,2,1-de][1,5]naphthyridin-3(2H)-yl)acetate

ent-D-noreburnamonine-18-one