[NH2:1][C:2]1[N:3]([CH2:13][C:14]2[S:15][CH:16]=[CH:17][CH:18]=2)[C:4]2[N:5]=[C:6]([NH2:12])[NH:7][C:8](=[O:11])[C:9]=2[N:10]=1.CN([CH:22]=[O:23])C.N1C=CC=C[CH:25]=1.[C:30](OC(=O)C)(=[O:32])[CH3:31]>CCOCC>[O:11]=[C:8]1[NH:7][C:6]([NH:12][C:30](=[O:32])[CH3:31])=[N:5][C:4]2[N:3]([CH2:13][C:14]3[S:15][CH:16]=[CH:17][CH:18]=3)[C:2]([NH:1][C:22](=[O:23])[CH3:25])=[N:10][C:9]1=2A mixture of 8-amino-9-[(2-thienyl)methyl]guanine (0.5 g; 1.88 mmol), DMF (10 ml), pyridine (5 ml), and acetic anhydride (5 ml) was stirred at room temperature for 36 hours. The mixture was diluted with ether (50 ml) and filtered to give analytically pure product, mp 243°-4° C.
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