| abstract |
The compound of the formula I, <IMAGE> in which R represents an aldehyde group or a group which can be converted into an aldehyde, R 1 and R 2 represent alkyl, alkenyl, alkynyl, aralkyl, cycloalkyl, hydrogen, sodium, potassium, calcium, magnesium, aluminum, Lithium, ammonium, triethylammonium or R¹ and R² together form a cyclic diester, R³ and R <4> represent alkyl, alkenyl, alkynyl, cycloalkyl, hydrogen, alkoxy or halogen, R <5> and R <8> represent alkyl, Alkenyl, alkynyl, aralkyl, cycloalkyl, alkoxy, phenyl, cyanide, hydroxy or hydrogen, X, Y or Z represent oxygen or sulfur or prodrug forms of the compound of formula I can be used for the treatment of diseases caused by viruses. The preparation of these compounds and pharmaceutical preparations containing them and their use are described. |