Provided is a pyridine derivative represented by formula (I), a prodrug thereof, a pharmaceutically acceptable salt of the pyridine derivative or the prodrug, or a solvate of the pyridine derivative, the prodrug or the pharmaceutically acceptable salt, which is useful for treatment or prophylaxis of diseases associated with URAT1 such as gout, hyperuricemia, hypertension, kidney diseases such as interstitial nephritis, diabetes, arteriosclerosis and Lesch-Nyhan syndrome.提供有用於痛風、高尿酸血症、高血壓症、間質性腎炎等之腎疾病、糖尿病、動脈硬化症、或Lesch-Nyhan syndrome等URAT1相關的疾病的治療或預防之以下述式(I)所表示的吡啶衍生物或者其前驅藥、或者彼等之醫藥上容許的鹽、或彼等之溶劑合物。
