(41'S,13a'R)-13a'-ethyl-3',41',5',6',13',13a'-hexahydrospiro[[1,3]dithiane-2,2'-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridin]-12'(1'H)-one

(1S,12bR)-1-ethyl-1-(2-hydroxyethyl)-4-oxo-2,3,6,7,12,12b-hexahydro-1H-indolo[2,3-a]quinolizine

eburnamonine-17α-xanthogenate

Δ14-vincanol

(R)-4-Ethyl-4-((S)-2-methoxymethyl-pyrrolidine-1-carbonyl)-3-trimethylsilanyl-cyclohexa-2,5-dienone