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Ketotifen N-Oxide Ketotifen EP Impurity D Ketotifen FuMarate EP IMpurity D 4-[(aRaS)-1-Methylpiperidin-4-ylide Ketotifen Impurity 4(Ketotifen EP Impurity D） 10-(1-methyl-1-oxidopiperidin-1-ium-4-ylidene)-5H-benzo[1,2]cyclohepta[3,4-b]thiophen-4-one 4,9-Dihydro-4-(1-Methyl-1-oxido-4-piperidinylidene)-10H-benzo[4,5]cyclohepta[1,2-b]thiophen-10-one 4,9-Dihydro-4-(1-Methyl-4-piperidinylidene)-10H-benzo [4,5]cyclohepta[1,2-b]thiophen-10-one N-Oxide 1-methyl-4-(10-oxo-9,10-dihydro-4H-benzo[4,5]cyclohepta[1,2-b]thiophen-4-ylidene)piperidine 1-oxide 10H-Benzo[4,5]cyclohepta[1,2-b]thiophen-10-one, 4,9-dihydro-4-(1-methyl-1-oxido-4-piperidinylidene)-