[NH2:1][C:2]1[N:7]([CH2:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[C:6](=[O:15])[N:5]([CH2:16][CH2:17][CH3:18])[C:4](=[O:19])[CH:3]=1.[N:20]([O-])=[O:21].[Na+].C(O)(=O)C>O>[CH2:8]([N:7]1[C:2]([NH2:1])=[C:3]([N:20]=[O:21])[C:4](=[O:19])[N:5]([CH2:16][CH2:17][CH3:18])[C:6]1=[O:15])[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=12.0 g (7.7 mmol) of 6-amino-1-benzyl-3-propyluracil are heated to 80° C. in 15 ml of water and mixed with a solution of 0.55 g of sodium nitrite in 3 ml of water. After the addition of 1 ml of glacial acetic acid a red solid is precipitated. The pH is adjusted to 4 and the suspension is stirred for a further 30 minutes at 80° C. After cooling, the crystals are filtered under suction and washed with water. 1.9 g of the title compound are obtained in the form of reddish-violet crystals (86% of theory), m.p. 208°-212° C./decomposition.
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