10H-Benzo(4,5)cyclohepta(1,2-b)thiophen-10-one, 4,9-dihydro-4-(1-methyl-4-piperidinylidene)-, (E)-2-butenedioate (1:1) 126939-14-8 34580-14-8 4,9-Dihydro-4-(1-methyl-4-piperidylidene)-10H-benzo(4,5)cyclohepta(1,2-b)thiophen-10-one fumarate