FIELD: medicine, pharmacology.
SUBSTANCE: invention relates to pharmaceutical means, particularly preventer of blood vessels intima hyperplasia, containing 3(2H)-pyridazinone substance, represented by formula (I) 
or its pharmaceutically suitable salt.
EFFECT: obtaining highly effective preventer of blood vessels intima hyperplasia; each of radicals R1, R2, R3, X, Y, and A, having parameters, detailed in description.
5 cl, 2 dwg, 5 ex
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