Loratadine N-Formyl Impurity; 11H-Benzo[5,6]cyclohepta[1,2-b]pyridine, 1-piperidinecarboxaldehyde deriv; 1-Piperidinecarboxaldehyde,4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene),Desloratadine Impurity
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