This disclosure concerns novel compounds of Formula (I) as defined in the specification and compositions comprising such novel compounds. These compounds are useful antiviral agents, especially in inhibiting the function of the NS5A protein encoded by Hepatitis C virus (HCV). Thus, the disclosure also concerns a method of treating HCV related diseases or conditions by use of these novel compounds or a composition comprising such novel compounds.本揭示內容係關於如本專利說明書中所定義之新穎式(I)化合物,及包含此種新穎化合物之組合物。此等化合物為有用抗病毒劑,尤其是在抑制被C型肝炎病毒(HCV)編碼之NS5A蛋白質之功能上。因此,本揭示內容亦關於一種使用此等新穎化合物或包含此種新穎化合物之組合物治療HCV相關疾病或症狀之方法。