8-Chloro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-one

8-Chloro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-one is an intermediate in synthesizing Ethyl 4-(8-chloro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)piperidine-1-carboxylate (E902775). It is an impurity of loratadine (L469575), which is a nonsedating-type histamine H1-receptor.