[Cl:1][C:2]1[C:3](=[S:9])[NH:4][C:5](=[O:8])[NH:6][CH:7]=1.[CH3:10]I>[H-].[Na+]>[CH3:10][S:9][C:3]1[C:2]([Cl:1])=[CH:7][NH:6][C:5](=[O:8])[N:4]=15-Chloro-4-thiouracil (0.0027 mol) was dissolved in 1 M sodium hydride (3 ml) and methyl iodide (0.007 mol) added. The solution was stirred at room temperature for 3 hr. and the solid precipitate collected and recrystallised from water; yield 21%, m.p. 254° C.
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