The present invention relates to novel hydroxy and polyhydroxy derivatives of coumarin fused with dialdehydes and aldehyde acids of the general formulae I, II, III and IV: ##STR1## wherein R.sup.1 =R.sup.2 =4-hydroxycoumarin; R.sup.1 =R.sup.2 =4,7-dihydroxycoumarin; R.sup.1 =R.sup.2 =4,5,7-trihydroxycoumarin; R.sup.1 =4-hydroxycoumarin, R.sup.2 =--CH(OH)CH.sub.3. An object of the invention are also processes for the preparation of hydroxy and polyhydroxy derivatives of coumarin fused with dialdehydes and aldehyde acids, and the antiviral action thereof. Novel hydroxy and polyhydroxy derivatives of coumarin according to the present invention exhibit antiviral action against HIV-1 virus.

Присытствыющий вымысел относит к роману окси и polyhydroxy производным кумарина сплавленным с диальдегидами и кислотами альдегида вообще формул ii1, II, III и IV: ## ## STR1 при котором R.sup.1 = R.sup.2 = 4-4-hydroxycoumarin; R.sup.1 = R.sup.2 = 4,7-dihydroxycoumarin; R.sup.1 = R.sup.2 = 4,5,7-trihydroxycoumarin; R.sup.1 = 4-4-hydroxycoumarin, R.sup.2 = - - CH(OH)CH.sub.3. Предметом вымысла будет также процессами для подготовки окси и polyhydroxy производных кумарина сплавленных с диальдегидами и кислотами альдегида, и противовирусным действием thereof. Производные романа окси и polyhydroxy кумарина согласно присытствыющему вымыслу exhibit противовирусное действие против вируса HIV-1.

 
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