(-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(dimethoxymethyl)-1H-pyrrolo<2,3-d>carbazole-6-carboxylate

(-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-3,5-ethano-12-oxo-1H-pyrrolo-<2,3-d>carbazole-6-carboxylate

(-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-3,5-ethano-12-(Z)-<(methoxycarbonyl)methylene>-1H-pyrrolo<2,3-d>carbazole-6-carboxylates

(-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-5-formyl-1H-pyrrolo<2,3-d>carbazole-6-carboxylate

(-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(2-hydroxyacetyl)-1H-pyrrolo<2,3-d>carbazole-6-carboxylate