The present invention provides a compound represented by the formula (I) or a pharmaceutically acceptable salt thereof or a pharmaceutical product or a pharmaceutical composition containing the same as an active ingredient, which has an excellent xanthine oxidase inhibitory activity and is useful as a therapeutic agent or a preventive agent for diseases associated with xanthine oxidase such as gout, hyperuricemia, tumor lysis syndrome, urinary calculi, hypertension, dyslipidemia, diabetes, cardiovascular diseases such as arteriosclerosis or heart failure, kidney diseases such as diabetic nephropathy, respiratory diseases such as chronic obstructive pulmonary diseases, inflammatory bowel diseases or autoimmune diseases.本發明係提供具有優異的黃嘌呤氧化酶阻礙活性，可用於痛風、高尿酸血症、腫瘤溶解症候群、尿路結石、高血壓症、脂質異常症、糖尿病、動脈硬化症或心衰竭等的心血管疾病、糖尿病性腎病等的腎疾病、慢性阻塞性肺疾病等的呼吸系統疾病、發炎性腸道疾病或自體免疫性疾病等與黃嘌呤氧化酶相關之疾病的治療藥或預防藥的含有式(I)所表示之化合物或者其製藥學上所容許的鹽、或彼等為有效成分之醫藥或者醫藥組成物。
