Synonyms: Piperidine, 4-(4H-benzo[4,5]cyclohepta[1,2-b]thien-4-ylidene)-1-methyl-, 4-(4H-Benzo[4,5]cyclohepta[1,2-b]thien-4-ylidene)-1-methylpiperidine, 4H-Benzo[4,5]cyclohepta[1,2-b]thiophene, piperidine deriv., 4-(4H-Benzo[4,5]cyclohepta[1,2-b]thiophen-4-ylidene)-1-methylpiperidine, Ketotifen Hydrogen Fumarate Imp. A (EP)