Benzoic acid, 2-(hexahydro-1-Methyl-1H-azepin-4-yl)hydrazide;N'-(1-Methylazepan-4-yl)benzohydrazide;1-Benzoyl-2-[(4RS)-1-methylhexahydro-1H-azepin-4-yl]diazane;Methylazepan benzohydrazide;Azelastine EP Impurity B;Azelastine EP Impurity B DiHCl;N''-[(4RS)-1-Methylhexahydro-1H-azepin-4-yl]benzohydrazide