[CH2:1]([N:4]1[C:11]([NH2:12])=[CH:10][C:8](=[O:9])[N:7]([CH2:13][CH:14]=[CH2:15])[C:5]1=[O:6])[CH:2]=[CH2:3].C(O)(=O)C.Cl.[N:21]([O-])=[O:22].[Na+]>O>[CH2:1]([N:4]1[C:11]([NH2:12])=[C:10]([N:21]=[O:22])[C:8](=[O:9])[N:7]([CH2:13][CH:14]=[CH2:15])[C:5]1=[O:6])[CH:2]=[CH2:3]1,3-Diallyl-6-aminouracil (5 g) was suspended in 400 ml of water in a 1 L round bottom flask with overhead stirring. Acetic acid (6.7 ml of a 20% solution) was added, followed by intermittent addition of 2 ml of concentrated hydrochloric acid and a sodium nitrite solution (1.53 g in 7 ml water). After 4 hours, this solution was filtered, washed with water, collected and dried in a vacuum oven at 80° C. for 20 hours to yield 4.54 g of 1,3-diallyl-5-nitroso-6-aminouracil as a purple solid, m.p. 170°-180° C. (87% yield).
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