8-Chloro-11-(piperidin-4-ylidene)-11H-benzo[5,6]cyclohepta[1,2-b]pyridine Hydrochloride is an impurity of Desloratadine (D290250). It was used to validate a stability-indicating ultra-performance liquid chromatography (UPLC) method for Desloratadine and its impurities in pharmaceutical dosage forms.