[CH3:1][O:2][CH2:3][C:4]1[C:5](=[O:11])[NH:6][C:7](=[O:10])[NH:8][CH:9]=1.[CH2:12](Br)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>>[CH2:12]([N:8]1[CH:9]=[C:4]([CH2:3][O:2][CH3:1])[C:5](=[O:11])[NH:6][C:7]1=[O:10])[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1substituting 5-methoxymethyl-2,4(1H,3H)-pyrimidinedione and benzyl bromide gave 1-benzyl-5-methoxymethyl-2,4(1H,3H)-pyrimidinedione, m.p. 134°-136° C.;
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