[CH3:1][N:2]([CH2:4][C:5]1[CH:10]=[CH:9][N:8]=[C:7]([CH2:11][S:12][CH2:13][CH2:14][NH2:15])[CH:6]=1)[CH3:3].[N+](N[C:20]1[NH:25][C:24](=[O:26])[C:23]([CH2:27][C:28]2[CH:33]=[CH:32][N:31]=[C:30]([O:34][CH3:35])[CH:29]=2)=[CH:22][N:21]=1)([O-])=O>N1C=CC=CC=1>[CH3:3][N:2]([CH2:4][C:5]1[CH:10]=[CH:9][N:8]=[C:7]([CH2:11][S:12][CH2:13][CH2:14][NH:15][C:20]2[NH:25][C:24](=[O:26])[C:23]([CH2:27][C:28]3[CH:33]=[CH:32][N:31]=[C:30]([O:34][CH3:35])[CH:29]=3)=[CH:22][N:21]=2)[CH:6]=1)[CH3:1]A solution of 2-(4-dimethylaminomethyl-2-pyridylmethylthio)ethylamine (1 g) and 2-nitroamino-5-(2-methoxy-4-pyridylmethyl)-4-pyrimidone (1.23 g) was refluxed in pyridine (6 ml) for 10 hours, concentrated in vacuo and chromatographed on silica gel column eluted with ethyl acetate-ethanol-28% W:W aqueous ammonia (by volume 10:15:2). Recrystallisation from acetonitrile:ether (1:5) gave 2-[2-(4-dimethylaminomethyl-2-pyridylmethylthio)ethylamino]-5-(2-methoxy-4-pyridylmethyl)-4-pyrimidone (1.21 g) m.p. 65°-74° C.
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