FIELD: organic chemistry, pharmacy. SUBSTANCE: invention describes the novel derivatives of 1,2,3,4- -tetrahydroquinoxalidinedione of the formula (I) 
where values A, R, R1,R2, X are given in point 1 of the invention claim. Compounds show antagonistic effect with respect to glutamate receptors, high affinity degree to AMPA-receptors that are not NMDA-receptors, strong inhibitory effect directed against neurotoxicity induced by kainic acid, inhibitory effect on audiogenic attack and high degree of solubility. Invention describes also pharmaceutical composition based on compounds of the formula (I). EFFECT: valuable pharmacological properties of compounds. 8 cl, 7 tbl
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