Abstract: Compounds of .alpha.,.omega.-dicarboxylic acids of the formula I ##STR1## in which X and Y, which can be the same or different, signify hydrogen, halogen, C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 -alkoxy, hydroxyl, cyano, carboxyl, C.sub.1 -C.sub.6 -alkoxycarbonyl or carbamoyl, R.sub.1 and R.sub.2, which can be the same or different, hydrogen or C.sub.1 -C.sub.6 -alkyl and Q a linear saturated or unsaturated alkylene chain with 2-14 C-atoms in which one or more C-atoms can be replaced by cyclohexyl rings, phenyl or heterocycles, as well as of their in vivo-hydrolysable carboxylic acid derivatives for the preparation of medicaments with fibrinogen-lowering action.