A series of compounds of Formula I which have anti-tumor activity, and are useful in treating viral infections, their compositions and use. ##STR1## In Formula I B is a purine or pyrimidine base; alk.sub.1 alk.sub.2 and alk.sub.3 are chemical bonds or alkylene groups; Q is hydrogen or hydroxyl; and R.sub.1 -R.sub.4 are hydrogen or alkyl.
一系列具有抗肿瘤活性的化合物,可用于治疗病毒感染,其组成和用途。在公式I中,B是
嘌呤或
嘧啶碱基;alk.sub.1、alk.sub.2和alk.sub.3是
化学键或烷基基团;Q是氢或羟基;R.sub.1-R.sub.4是氢或烷基。