The invention relates to compounds of the formula Ihaving antithrombotic activity, which in particular inhibit blood clotting factor IXa, to processes for their preparation and to use thereof as medicaments.本發明有關具有抗血栓活性之式I之化合物其尤其可抑制凝血因子IXa,且有關該等化合物之製備方法及其作為藥劑之用途。