Desloratadine Impurity 5 Catalogue D225638 CAS 119410-08-1 M.W C19H19ClN2O M.F 326.82 Specifications FAQs 8-chloro-11-(piperidin-4-ylidene)-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridin-3-ol