Compounds of formula I, in which R1, R2, A, and B having the definitions set forth in the claims, are valuable pharmacologically active compounds, which exhibit a strong antithrombotic effect and are suitable, for example, for treating thromboembolic diseases and restenoses. They are reversible inhibitors of the blood clotting enzyme factor VIIa and can in general be applied in conditions in which an undesired activity of factor VIIa is present or for the cure or prevention of which an inhibition of factor VIIa is intended. Also disclosed are processes for the preparation of compounds of formula I, their use, in particular as active ingredients in pharmaceuticals, and pharmaceutical preparations comprising them.