The problem to be solved by the present invention is to provide: a novel compound which has an EGFR-inhibiting activity and also has a cell proliferation-inhibiting effect and a medicine which has an EGFR-inhibiting activity and is therefore useful for the prevention and/or treatment of cancer. The present invention provides a compound represented by general formula (I) or a salt thereof.本發明課題係提供一種具有EGFR抑制作用,並具有細胞增殖抑制效果之新穎的化合物。又,基於EGFR抑制作用,而提供一種對於癌症之預防及/或治療係有用的醫藥。解決手段係一種下述通式(I)所示化合物或其鹽:
