英文别名Azelastine EP Impurity E; Azelastine EP Impurity E (Z-Isomer); 1(3H)-Isobenzofuranone, 3-[(4-chlorophenyl)methylene]-, (3Z)-; Azelastine Hydrochloride Impurity E as Z-Isomer; Azelastine Hydrochloride EP Impurity E as Z-Isomer; (Z)-3-(4-chlorobenzylidene)isobenzofuran-1(3H)-one (Azelastine Impurity); (Z)-3-(4-chlorophenyl)methylidenephthalide; 4-chlorobenzalphthalide; (Z)-3-(p-chlorobenzylidene)isobenzofuran-1(3H)-one (3be); 3-(p-chlorobenzylidene)phthalide; 3-(4-chlorobenzylidene)isobenzofuran-1(3H)-one; 3-[1-(4-Chloro-phenyl)-meth-(Z)-ylidene]-3H-isobenzofuran-1-one 
