FIELD: organic chemistry, pharmacy. SUBSTANCE: invention describes new derivatives of 5,6-dihydro-pyrone of the general formula (I) 
where R1,R2,R3, X, Y are given in p. 1 of the invention claim. Compounds show an antibacterial and an antiviral activity. Invention describes also a pharmaceutical composition based on compounds of the formula (I). EFFECT: new compounds indicated above, valuable biological properties. 6 cl, 3 tbl, 133 ex
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