cis-(H-1/H-12b)-1-hydroxy-1,2,3,4,6,7,12,12b-octahydroindolo(2,3-a)quinolizine

t-butyl 5-ethoxycarbonyl-3-oxo-2-(triphenylphosphoranylidine)-pentanoate

1-hydroxy-1,2,3,6,7,12b-hexahydroindolo[2,3-a]quinolizin-4(12H)-one

1-(t-butoxycarbonyl)-1-(3-ethoxycarbonyl-1-oxo-propyl)-2,3,4-trihydro-β-carboline

1-(benzyloxy)-3,4,6,7,12,12b-hexahydroindolo[2,3-a]quinolizine