| abstract |
Abstract Compounds of the formula wherein A is C1-8-alkylene, R1 is halogen, C1-4--alkyl or halo-(C1-4-alkyl), R2 is hydrogen, hydroxy or acyloxy, R3 is hydrogen or C1-4-alkyl, R4 is aryl or aryloxy and X is O or NH, and tautomers thereof, possess antiviral activity and can be used in the form of medicaments for the control and preven-tion of viral infections. They can be manufactured according to generally known methods. |