N-(2-hydroxyethyl)-2-<1-(phenylsulfonyl)-3-indolyl>-4-piperidone ethylene acetal

N-<(S)-1-carboxymethyl-2-(indol-3-yl)ethyl>-4-oxo-2,3-didehydro-piperidine

1,2,3,4,6,7,12,12b-octahydro-2-(1,3-dithiolan-2-yl)-indolo<2,3-a>-(6S,12bR)-6-cyano-quinolizine

1,2,3,4,6,7,12,12b-octahydro-2-(1,3-dithiolan-2-yl)-indolo<2,3-a>-(6S,12bR)-6-carboxy-quinolizine