[NH2:1][C:2]1[N:7]=[C:6]([S:8][CH3:9])[N:5]([CH3:10])[C:4](=[O:11])[C:3]=1[N:12]=O>[NH4+]=S>[NH2:12][C:3]1[C:4](=[O:11])[N:5]([CH3:10])[C:6]([S:8][CH3:9])=[N:7][C:2]=1[NH2:1]To 4.0 g (0.02 mole) of 6-amino-3-methyl-2-methylthio-5-nitroso-pyrimidine-4-one (44) was added 40 mL of 20% aqueous ammonium sulfide solution. The mixture was heated under reflux for 30 min. After cooling the precipitate was collected, washed with a little ethanol and dried in a desiccator to give 45 as 2.72 g (75% yield) of colorless crystals (m.p. 211°-212° C.).
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