英文别名9-Oxo Ketotifen; 10-(1-methylpiperidin-4-ylidene)-4H-benzo[1,2]cyclohepta[3,4-b]thiophen-5-one; 4,10-Dihydro-4-(1-Methyl-4-piperidinylidene)-9H-benzo[4,5]cyclohepta[1,2-b]thiophen-9-one; Ketotifen Fumarate EP Impurity F; Ketotifen EP Impurity F; Ketotifen Impurity 6