10H-Benzo[4,5]cyclohepta[1,2-b]thiophen-10-one, 4,9-dihydro-4-(1-methyl-4-piperidinylidene)-, (2E)-2-butenedioate (1:1) 34580-13-7 (FREE BASE) 4-(1-Methyl-4-piperidylidene)-9-hydrobenzo[a]thiopheno[3,2-d][7]annulen-10-one AIDS-033084 AIDS033084 Antihistamine compound Ketotifen