4,9-Dihydro-4-(1-methyl-4-piperidinylidene)-10H- benzo[4,5]cyclohepta[1,2-b]thiophen-10-one (2E)-2-Butenedioate; 4-(1-methylpiperidin-4-ylidene)-4H-benzo[4,5]cyclohepta[1,2-b]thiophen-10(9H)-onefumarate
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