4-(4-chloro-benzyl)-2h-phthalazin-1-one;4-[(4-chlorophenyl)methyl]phthalazin-1(2h)-one;4-(4-Chlorobenzyl)-1,2-dihydrophthalazine-1-one;4-[(4-Chlorophenyl)methyl]-1(2H)-phthalazinone;4-(4-Chlorobenzyl)-1(2H)-phthalazinone;Azelastine Related CoMpound D;Azelastine Impurity D(USP);Phthalazinone Azelastine Analog