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