PROBLEM TO BE SOLVED: To provide compounds and methods effective as inhibitors of HCV, and effective, alone and together with other therapeutic agents, in treating or preventing diseases or disorders such as viral infections and virus-related disorders.SOLUTION: Substituted pyridine derivatives represented by the formula (I) in the figure are used.【課題】HCVのインヒビターとして有効であり、単独でも他の治療剤と一緒でも、ウイルス感染症およびウイルス関連障害などの疾患もしくは障害の治療または予防に有効な化合物、及び方法の提供。【解決手段】下記式(I)で表される置換ピリジン誘導体の使用。【選択図】なし