3-[(4-chlorophenyl)methylene]phthalide, 3-(4-chlorobenzylidene)-2-benzofuran-1(3H)-one, 3-(4-Chlorobenzylidene)-2,4-pentanedione, 3-(p-Chlorobenzylidene)phthalide, 1-Oxo-3-(4-chlor-benzyliden)-phthalan, 3-(4-chlorobenzylidene)pentane-2,4-dione, Azelastine impurity E, 3-(4-chloro-benzylidene)-3H-isobenzofuran-1-one, 3-(p-chlorobenzylidene)-2,4-pentandione