(-)-(21E)-12,13-didehydro-24-(tert-butyldimethylsilyl)-12,24-secostrychnidin-10-one

(4aS,9aS)-4a-cyanomethyl-9-(4-methylbenzenesulfonyl)-2,4a,9,9a-tetrahydro-1H-carbazole

(S)-N-(2-bromophenyl)-N-[(2-cyanomethyl)-2-cyclohexenyl]-4-methylbenzenesulfonamide

(4aS,9aS)-4a-[(2-tert-butoxycarbonylamino)ethyl]-9-(4-methylbenzenesulfonyl)-2,4a,9,9a-tetrahydro-1H-carbazole

(S)-N-(2-bromophenyl)-N-(2-(2-tert-butyldimethylsiloxy)methylcyclohex-2-en-1-yl)(4-methylbenzene)sulfonamide