CAS: 34580-14-8 Molecular Formula: C19 H19 N O S . C4 H4 O4 Molecular Weight (g/mol): 425.5 Synonym: Ketotifen Hydrogen Fumarate,10H-Benzo[4,5]cyclohepta[1,2-b]thiophen-10-one, 4,9-dihydro-4-(1-methyl-4-piperidinylidene)-, (2E)-2-butenedioate (1:1),10H-Benzo[4,5]cyclohepta[1,2-b]thiophen-10-one, 4,9-dihydro-4-(1-methyl-4-piperidinylidene)-, (E)-2-butenedioate (1:1),Allerkif,HC 20511,HC 20511 fumarate,Ketotifen fumarate,Ketotifen hydrogen fumarate,Totifen,Zaditen,Zaditor,Zasten IUPAC Name: (E)-but-2-enedioic acid;10-(1-methylpiperidin-4-ylidene)-5H-benzo[1,2]cyclohepta[2,4-b]thiophen-4-one SMILES: CN1CCC(=C2c3ccccc3CC(=O)c4sccc24)CC1.OC(=O)\C=C\C(=O)O