DERIVES DE PYRAZOLIDINE-DIONE ET LEUR APPLICATION EN THERAPEUTIQUE

Dérivés de pyrazolidine-dione répondant à la formule : Pyrazolidine-dione derivatives of the formula in which R1 and R2 are the same or different and each is hydrogen or alkyl of 1 to 6 carbon atoms, or R1 and R2 together with the nitrogen to which they are attached form a heterocyclic ring which may or may not contain another hetero-atom which can itself carry a substituent, are useful in therapy as inhibitors of platelet aggregation. They may be made from the corresponding unsubstituted pyrazolidine-dione by a Mannich reaction.