Desloratadine Impurity 6 Catalogue D225639 CAS 119410-05-8 M.W 326.82 M.F C19H19ClN2O Specifications FAQs 8-chloro-11-(piperidin-4-ylidene)-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridin-6-ol