The subject of the present invention is specific lipidesters of
halogenated nucleotides of the following formula ##STR00001## wherein
R.sup.1, R.sup.2, R.sup.3, X and Y are defined as described herein and
salts thereof, said compounds have anti-cancer properties; pharmaceutical
compositions containing the compounds, a method of synthesizing the
compounds, and a method of using the compounds for treating malignant
tumors.