(3aS,6aS,11bS)-3-tert-butoxycarbonyl-1,2,3a,4,6a,7-hexahydro-pyrrolo[2,3-d]carbazole

(3aS,6aS,11bR)-3-tert-butoxycarbonyl-7-(4-methylbenzenesulfonyl)-1,2,3a,4,6a,7-hexahydro-pyrrolo[2,3-d]carbazole

(3aR,11bS,13aS)-9-oxo-1,2,3,11a,11b,13a-hexahydro-9H-pyrido[1,2,3-lm]pyrrolo[2,3-d]carbazole-1-carboxylic acid tert-butyl ester

(3aS,6aS,11aR)-7-(3-bromoacryloyl)-1,2,3a,4,6a,7-hexahydropyrrolo[2,3-d]carbazole-3-carboxylic acid tert-butyl ester

(3aS,6aS,11aR)-3-tert-butoxycarbonyl-5-trifluoromethanesulfonyloxy-7-(4-methylbenzenesulfonyl)-5-oxo-1,2,3a,4,6a,7-hexahydropyrrolo[2,3-d]carbazole