8-Chloro-5,11-dihydro-11-(1-methyl-4-piperidinylidene)-6H-benzo<5,6>cyclohepta<1,2-b>pyridin-6-one

Ethyl 4-[8-Chloro-6-[(ethoxycarbonyl)oxy]-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene]-1-piperidinecarboxylate

Ethyl 4-(8-Chloro-5,6-dihydro-6-oxo-11H-benzo(5,6)cyclohepta(1,2-b)pyridin-11-ylidene)-1-piperidinecarboxylate