The present invention provides a compound having antivirus effect, especially, having proliferation inhabitation activity to influenza virus. More preferably, it is provided a prodrug of substituted 3-hydroxy-4-pyridone derivative showing cap-dependent endonuclease inhibition activity.本發明係提供具有抗病毒作用之化合物,尤其具有流行性感冒(influenza)病毒之增殖抑制活性,更佳為顯示抑制依存cap的核酸內切酶(cap-dependent endonuclease)活性之經取代的3-羥基-4-吡啶酮衍生物之前藥。