PROBLEM TO BE SOLVED: To provide novel crystalline salts of a compound for use in HCV treatment.SOLUTION: This invention relates to novel tris(hydroxymethyl)aminomethane, choline and N-methyl-D-glucamine salt forms of, e.g., a compound represented by the formula in the figure, and their use in treatment of Hepatitis C Viral (HCV) infection.【課題】HCV治療に用いる化合物の新規な結晶塩の提供。【解決手段】下記式で表される化合物等の新規なトリス(ヒドロキシメチル)アミノメタン、コリン及びN-メチル-D-グルカミン塩形態、及びC型肝炎ウイルス(HCV)感染治療への使用。【選択図】なし