Phosphonomethylthio-alkoseypureine derivatives, intermediate products for their preparation and pharmaceutical compositions containing them.

摘要

Compounds of formula (I), and pharmaceutically acceptable salts thereof: <CHEM> wherein R1 is hydroxy or amino; R2 is hydrogen or amino; R3 is hydrogen, hydroxymethyl or acyloxymethyl; R4 is a group of formula: <CHEM> wherein R5 and R6 are independently selected from hydrogen, C1-6 alkyl and optionally substituted phenyl; or R3 and R4 together are: <CHEM> wherein R6 is as defined above; having antiviral activity, processes for their preparation and their pharmaceutical use.