[K].[F:2][C:3]1[C:4](=[S:10])[NH:5][C:6](=[O:9])[NH:7][CH:8]=1.[CH2:11](I)[CH3:12]>CO>[CH2:11]([S:10][C:4]1[C:3]([F:2])=[CH:8][NH:7][C:6](=[O:9])[N:5]=1)[CH3:12]The potassium salt of 5-fluoro-4-thiouracil (0.0065 mol) and ethyl iodide (0.014 mol) in methanol (40 ml) were stirred at room temperature for 6 days. The solutions were concentrated at reduced pressure and water (6 ml) added. The slowly precipitated product was recrystallised from water; yield 70%, m.p. 168° C.
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