[CH:1]([CH:4]1[NH:8][C:7](=[O:9])[NH:6][C:5]1=[O:10])([CH3:3])[CH3:2].[CH3:11]I>>[CH:1]([CH:4]1[NH:8][C:7](=[O:9])[N:6]([CH3:11])[C:5]1=[O:10])([CH3:3])[CH3:2]Using 5-isopropylimidazolidine-2,4-dione (1.00 g) and methyl iodide (0.46 mL) and by the reaction and treatment in the same manner as in Preparation Example 214, the title compound (0.88 g) was obtained.
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