1H-Benzimidazole, 4,5,6,7-tetrahydro-1-ethyl-5-(1-pyrrolidinyl)-, (E)-2-butenedioate (2:5) 4,5,6,7-Tetrahydro-1-ethyl-5-(1-pyrrolidinyl)benzimidazole fumarate (2:5) 99700-13-7 Benzimidazole, 4,5,6,7-tetrahydro-1-ethyl-5-(1-pyrrolidinyl)-, fumarate (2:5)