PROBLEM TO BE SOLVED: To provide a novel method for producing a resveratrol derivative, a xanthine oxidase inhibitor containing the resveratrol derivative, a uric acid production inhibitor, an agent for improving or preventing gout or hyperuricemia, and a food and drink composition for lowering uric acid level. Providing goods. A method for producing a resveratrol derivative having a step of producing a resveratrol derivative represented by the following formula by heating a solution containing resveratrol and caffeic acid under high pressure. [Selection diagram] None【課題】レスベラトロール誘導体の新規な製造方法、当該レスベラトロール誘導体を含有するキサンチンオキシダーゼ阻害剤、尿酸生成阻害剤、痛風又は高尿酸血症の改善又は予防剤並びに尿酸値低下用飲食品組成物の提供。【解決手段】レスベラトロールおよびカフェ酸を含む溶液を高圧下で加熱処理することで、下式のレスベラトロール誘導体を生成する工程を有する、レスベラトロール誘導体の製造方法。【選択図】なし
