4-[(4-chlorophenyl)methyl]-2-[(4S)-1-methylazepan-4-yl]phthalazin-1-one (S)-4-[(4-Chlorophenyl)methyl]-2-(hexahydro-1-methyl-1H-azepin-4-yl)-1(2H)-phthalazinone (S)-Azelastine 1(2H)-Phthalazinone, 4-[(4-chlorophenyl)methyl]-2-(hexahydro-1-methyl-1H-azepin-4-yl)-, (S)- 1(2H)-Phthalazinone, 4-[(4-chlorophenyl)methyl]-2-[(4S)-hexahydro-1-methyl-1H-azepin-4-yl]- (S)-Azelastine Hydrochloride 1