Chemical Name: Ethyl (E)-4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-3,4-dihydropyridine-1(2H)-carboxylate compound with ethyl (Z)-4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-3,4-dihydropyridine-1(2H)-carboxylate (1:1)