Phthalide, 3-(p-chlorobenzylidene)- (6CI,7CI,8CI), Azelastine Hydrochloride Imp. E (EP),1(3H)-Isobenzofuranone, 3-[(4-chlorophenyl)methylene]-, Azelastine Imp. E (EP), 3-(4-Chlorobenzal)phthalide, 3-(4-Chlorobenzylidene)-2-benzofuran-1(3H)-one, 3-(p-Chlorobenzylidene)phthalide, Azelastine Related Compound E (USP), Azelastine USP Related Compound E, Azelastine USP RC E
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