(6S,12bR)-tert-butyl-6-formyl-1,2,3,4,6,7-hexahydro-4-oxoindolo[2,3-a]quinolizine-12(12bH)-carboxylate

(6S,12bR)-1,2,3,6,7,12b-hexahydro-6-(hydroxymethyl)indolo[2,3-a]quinolizin-4(12H)-one

(6S,12bR)-4-oxo-1,2,3,4,6,7,12,12b-octahydropyrido[2,1-a]β-carboline-6-carbaldehyde

(6S,12bR)-12-(tert-butoxycarbonyl)-1,2,3,4,6,7,12,12b-octahydro-4-oxoindolo[2,3-a]quinolizine-6-carboxylic acid

(12bR)-tert-butyl-1,2,3,4,6,7-hexahydro-4-oxoindolo[2,3-a]quinolizine-12(12bH)-carboxylate