CAS: 20526-97-0 Molecular Formula: C15 H9 Cl O2 Molecular Weight (g/mol): 256.68 Synonym: 1(3H)-Isobenzofuranone, 3-[(4-chlorophenyl)methylene]-,Phthalide, 3-(p-chlorobenzylidene)- (6CI,7CI,8CI),3-(4-Chlorobenzal)phthalide,3-(4-Chlorobenzylidene)-2-benzofuran-1(3H)-one,3-(p-Chlorobenzylidene)phthalide,Azelastine Related Compound E (USP) IUPAC Name: 3-[(4-chlorophenyl)methylidene]-2-benzofuran-1-one SMILES: Clc1ccc(C=C2OC(=O)c3ccccc23)cc1