3,7-Dibromo-8,11-dichloro-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridine

(-)-4-<3,10-dibromo-8-chloro-6,11-dihydro-5H-benzo<5,6>cyclohepta<1,2-b>pyridin-11-yl>-1-piperazine

(+)-4-<3,10-dibromo-8-chloro-6,11-dihydro-5H-benzo<5,6>cyclohepta<1,2-b>pyridin-11-yl>-1-piperazine

4-(3,7-dibromo-8-chloro-5,6-dihydro-9-nitro-11H-benzo-<5,6>cyclohepta<1,2-b>pyridin-11-ylidene)-1-piperidinecarboxylic acid ethyl ester