E. 1-{3-[4-(5-chlor-2,3-dihydro-2-oxo-1H-benzimidazol-1-yl)-1-piperidyl]propyl}-3-[3-(2,3-dihydro--2-oxo-1H-benzimidazol-1-yl)propyl]-2,3-dihydro-1H-benzimidazol-2-on,