Compounds having the formula Ia or Ib wherein R
1
, R
2
, R
3
and R
4
are as defined herein are Hepatitis C virus NS5b polymerase inhibitors. Also disclosed are compositions and methods for treating an HCV infection and inhibiting HCV replication.
具有Ia或Ib式中定义的R1、R2、R3和R4的化合物是丙型肝炎病毒NS5b聚合酶
抑制剂。还公开了治疗HCV感染和抑制HCV复制的组合物和方法。