PROBLEM TO BE SOLVED: To provide formulations comprising a protein in combination with a compound that prevents oxidation of the protein.SOLUTION: The present invention provides a liquid formulation comprising a protein and a compound which prevents oxidation of the protein in the liquid formulation, the liquid formulation including a compound represented by the following formula, or a pharmaceutically acceptable salt thereof. [R2 is selected from H, hydroxyl, -COOH, and -CH2COOH； R3 is selected from H, hydroxyl, -COOH, -CH2COOH, and -CH2CHR3a(NH2)； where R3a is COOH or H； R4-R7 independently represent H or hydroxyl； where, one of R2-R7 is hydroxyl].SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】タンパク質と、タンパク質の酸化を防止する化合物の組合せを含む製剤の提供。【解決手段】タンパク質と、液体製剤中のタンパク質の酸化を防止する、下記式で表される化合物又はその薬学的に許容される塩とを含む液体製剤。［Ｒ２は、Ｈ、ヒドロキシル、－ＣＯＯＨ、及び－ＣＨ２ＣＯＯＨから選択され；Ｒ３は、Ｈ、ヒドロキシル、－ＣＯＯＨ、－ＣＨ２ＣＯＯＨ、及び－ＣＨ２ＣＨＲ３ａ（ＮＨ２）から選択され；ここでＲ３ａはＣＯＯＨ又はＨであり；Ｒ４～Ｒ７は、各々独立して、Ｈ又はヒドロキシル；但し、Ｒ２～Ｒ７の一つはヒドロキシル］【選択図】図１
