Desloratadine Impurity 1 Catalogue D225634 CAS 38092-95-4 M.W 276.38 M.F C19H20N2 Specifications FAQs Synonyms:11-(Piperidin-4-ylidene)-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridine