1-(2-n-Propoxyethyl)-2-(4-methyl-1-piperazinyl)methylbenzimidazole difumarate 1H-Benzimidazole, 2-((4-methyl-1-piperazinyl)methyl)-1-(2-propoxyethyl)-, (E)-2-butenedioate (1:2) 95894-09-0