The present invention comprises novel and known purine and pyrimidine nucleoside derivatives which have been discovered to be active against hepatitis C virus (HCV). The use of these derivatives for the treatment of HCV infection is claimed as are the novel nucleoside derivatives disclosed herein.
The present invention provides a compound of formula (I)
and salts and solvates thereof, and describes processes for their preparation, pharmaceutical compositions containing them and their use in the treatment of viral diseases, especially those caused by the Herpetoviridae.