Cl[C:2]1[N:7]([CH3:8])[C:6](=[O:9])[N:5]([CH3:10])[C:4](=[O:11])[C:3]=1[C:12]#[N:13].[OH2:14].O.O.C([O-])(=O)C.[Na+].Cl.[NH2:23]O>CO>[NH2:13][C:12]1[O:14][N:23]=[C:2]2[C:3]=1[C:4](=[O:11])[N:5]([CH3:10])[C:6](=[O:9])[N:7]2[CH3:8]1.4 g of 6-chloro-5-cyano-1,3-dimethyluracil was stirred together with a mixture of 150 ml of methanol, 6.0 g of sodium acetate trihydrate and 3.0 g of hydroxylamine hydrochloride at room temperature for 3 hours. Resulting precipitates were recovered by filtration and washed with 10 ml of water twice and then with 5 ml of methanol. The precipitates were recrystallized from dimethylformamide-water to give 1.2 g of light yellow prisms, melting point: 280°-284° C. (decomp.). Ultraviolet absorption spectrum: λmax H2O 266 nm (ε=8780)
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