The disclosure provides compounds of formula I, including their salts, as well as compositions and methods of using the compounds. The compounds have activity against hepatitis C virus (HCV) and may be useful in treating those infected with HCV.本發明提供式I化合物(包含其鹽)以及使用該等化合物之組合物及方法。該等化合物具有抵抗C型肝炎病毒(HCV)之活性且可用於治療彼等感染HCV者。