PROBLEM TO BE SOLVED: To provide novel pyrimidine nucleoside compounds that exhibit an excellent balance between antitumor effect and toxicity compared to existing pyrimidine nucleoside compounds.SOLUTION: The present invention provides pyrimidine nucleoside compounds represented by the general formula (1) in the figure or salts thereof.COPYRIGHT: (C)2015,JPO&INPIT【課題】既存のピリミジンヌクレオシド化合物よりも抗腫瘍効果と毒性の優れたバランスを示す、新規なピリミジンヌクレオシド化合物を提供する。【解決手段】下記一般式(1)【化1】で表されるピリミジンヌクレオシド化合物又はその塩。【選択図】なし