[CH3:1][C:2]1([CH3:9])[CH2:6][O:5][C:4](=[O:7])[C:3]1=O.[ClH:10].[NH2:11][NH:12][C:13]([NH:15][NH2:16])=[NH:14].O>C(O)C>[ClH:10].[NH2:14][C:13]1[N:15]([NH2:16])[C:4](=[O:7])[C:3]([C:2]([CH3:9])([CH3:1])[CH2:6][OH:5])=[N:11][N:12]=1Dihydro-4,4-dimethyl-2,3-furandione (2 g, 15.6 mmole) and 1,3-diaminoguanidine monohydrochloride (12.96 g, 15.61 mmole) were dissolved in ethanol and the resulting solution heated to reflux temperatures. To the refluxing reaction mixture, was added water until a clear solution was obtained. The mixture was then refluxed overnight, cooled to room temperature and stored at −20° C. overnight. The product which separated was filtered and dried. It was crystallized from a mixture of ethanol and water to give 3,4-diamino-6-(1′,1′-dimethyl-2′-hydroxyethyl)-1,2,4-triazin-5(4H)-one hydrochloride (2.24 g, 61%), m.p. 221-222° C. (dec).
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