Benzoic Acid 2-(Hexahydro-1-Methyl-1H-azepin-4-yl)hydrazide Hydrochloride;Azelastine Hydrochloride IMpurity B;N'-(1-Methylazepan-4-yl)benzohydrazine;Azelastine HCl EP Impurity B;Azelastine Related Compound B (N''-(1-methylazepan-4-yl)benzohydrazide hydrochloride) (1046170);Azdrostine hydrochloride EP impurity B;N’-(1-Methylazepan-4-yl)benzohydrazine Monohydrochloride Salt;Azelastine Impurity 4(Azelastine EP Impurity B)