Ketotifen EP Impurity A;10-Deoxo-9,10-dehydro Ketotifen;Ketotifen FuMarate EP IMpurity A;Ketotifen EP Impurity A Fumarate;Ketotifen Impurity 1(Ketotifen EP Impurity A）;4-benzo[1,2]cyclohepta[3,4-b]thiophen-10-ylidene-1-methylpiperidine;4-(4H-Benzo[4,5]cyclohepta[1,2-b]thien-4-ylidene)-1-Methylpiperidine;4-(4H-benzo[4,5]cyclohepta[1,2-b]thiophen-4-ylidene)-1-methylpiperidine;Piperidine, 4-(4H-benzo[4,5]cyclohepta[1,2-b]thien-4-ylidene)-1-methyl-
