[CH3:1][O:2][C:3]1[CH:18]=[CH:17][CH:16]=[CH:15][C:4]=1[CH2:5][C:6]1[C:7](=[O:14])[NH:8][C:9](SC)=[N:10][CH:11]=1.[CH3:19][C:20]1[NH:24][CH:23]=[N:22][C:21]=1[CH2:25][S:26][CH2:27][CH2:28][NH2:29]>C(O)C>[CH3:19][C:20]1[NH:24][CH:23]=[N:22][C:21]=1[CH2:25][S:26][CH2:27][CH2:28][NH:29][C:9]1[NH:8][C:7](=[O:14])[C:6]([CH2:5][C:4]2[CH:15]=[CH:16][CH:17]=[CH:18][C:3]=2[O:2][CH3:1])=[CH:11][N:10]=15-(2-Methoxybenzyl)-2-methylthio-4-pyrimidone (2.00 g) was reacted with 2-(5-methyl-4-imidazolylmethylthio)-ethylamine (1.37 g) by the procedure of Example 1(ii) to give 2-[2-(5-methyl-4-imidazolylmethylthio)ethylamino]-5-(2-methoxybenzyl)-4-pyrimidone, m.p. 163°-167° C. (ex ethanol).
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