Quinoxazolines having antithrombotic activity. Exemplary of those disclosed are:
4-{[6-(N-carboxymethyl-quinolin-8-yl-sulphonylamino)-1-methyl-2-oxo-1,2-dihydroquinoxalin-3-yl]-methyl}-benzamidine,
4-{[6-(1-(N-cyclopentyl-carboxymethylcarbonylamino)-cyclo-propyl)-1-methyl-2-oxo-1,2-dihydroquinoxalin-3-yl]-methyl}-benzamidine, and
4-{[7-(N-carboxymethylaminocarbonyl-ethylamino)-4-methyl-quinolin-2-yl]-oxo}-benzamidine.