9-Oxo Ketotifen;4,10-Dihydro-4-(1-Methyl-4-piperidinylidene)-9H-benzo[4,5]cyclohepta[1,2-b]thiophen-9-one;Ketotifen FuMarate EP IMpurity F;4-(1-methylpiperidin-4-ylidene)-4H-benzo[4,5]cyclohepta[1,2-b]thiophen-9(10H)-one;Ketotifen EP Impurity F;Ketotifen Impurity 6(Ketotifen EP Impurity F）;9H-Benzo[4,5]cyclohepta[1,2-b]thiophen-9-one, 4,10-dihydro-4-(1-methyl-4-piperidinylidene)-;4-(1-Methylpiperidin-4-ylidene)-4,10-dihydro-9H-benzo[4,5]cyclohepta[1,2-b]thiophen-9-one
