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

(+/-)-ethyl-(1,2,3,4,6,7,12,12bα-octahydro-indolo(2,3-a)quinolizin-1β-yl)pyruvate oxime

(+/-)-ethyl-(1,2,3,4,6,7,12,12bα-octahydro-indolo(2,3-a)quinolizin-1β-yl)pyruvate oxime

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

methyl (E)-3-((1S,12bS)-1-ethyl-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizin-1-yl)-2-(hydroxyimino)propanoate