143540-37-8 5H-Benzo(5,6)cyclohepta(1,2-b)pyridine-8-carbonitrile, 6,11-dihydro-11-(1-methyl-4-piperidinylidene)- 8-Cyano-11-(1-methyl-4-piperidylidene)-6,11-dihydro-5H-benzo(5,6)cyclohepta(1,2-b)pyridine