[CH3:1][CH:2]1[NH:6][C:5](=[O:7])[NH:4][C:3]1=[O:8].[CH3:9]I>>[CH3:9][N:4]1[C:3](=[O:8])[CH:2]([CH3:1])[NH:6][C:5]1=[O:7]Using 5-methylimidazolidine-2,4-dione (1.00 g) and methyl iodide (0.57 mL) and by the reaction and treatment in the same manner as in Preparation Example 214, the title compound (1.66 g, containing DMF) was obtained.
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