An object of the present invention is to provide a terminal saccharified product production inhibitor capable of suppressing the production of advanced saccharified products. The present invention relates to an advanced saccharified product production inhibitor comprising a compound represented by the formula (1) or a pharmaceutically acceptable salt thereof as an active ingredient. In the formula, n represents an integer of 0 to 4. The compound represented by the formula (1) or a pharmaceutically acceptable salt thereof can significantly suppress an increase in the HbA1c value. [Selection diagram] FIG.【課題】終末糖化産物の生成を抑制可能な終末糖化産物生成抑制剤を提供する。【解決手段】式（１）で表される化合物又はその薬学的に許容される塩を有効成分として含む終末糖化産物生成抑制剤である。式中、ｎは０から４の整数を示す。式（１）で表される化合物又はその薬学的に許容される塩は、ＨｂＡ１ｃ値の上昇を有意に抑制することができる。【選択図】図７
