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Azelastine N-Oxide Azelastine USP Related Compound F Azdrostine N-oxide (diastereoisomer mixture) Azelastine N-Oxide (Mixture of DiastereoMers) 4-(4-(4-chlorobenzyl)-1-oxophthalazin-2(1H)-yl)-1-methylazepane 1-oxide 4-[(4-chlorophenyl)methyl]-2-(1-methyl-1-oxidoazepan-1-ium-4-yl)phthalazin-1-one 4-[(4-Chlorophenyl)Methyl]-2-(hexahydro-1-Methyl-1-oxido-1H-azepin-4-yl)-1(2H)-phthalazinone 1(2H)-Phthalazinone, 4-[(4-chlorophenyl)methyl]-2-(hexahydro-1-methyl-1-oxido-1H-azepin-4-yl)- (R)-4-[(4-Chlorophenyl)Methyl]-2-(hexahydro-1-Methyl-1-oxido-1H-azepin-4-yl)-1(2H)-phthalazinone (S)-4-[(4-Chlorophenyl)Methyl]-2-(hexahydro-1-Methyl-1-oxido-1H-azepin-4-yl)-1(2H)-phthalazinone