[NH2:1][N:2]1[C:7](=[O:8])[C:6]([CH3:9])=[N:5][N:4]=[C:3]1[SH:10].[OH-].[Na+].[CH2:13](Cl)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>O.C(O)C>[NH2:1][N:2]1[C:7](=[O:8])[C:6]([CH3:9])=[N:5][N:4]=[C:3]1[S:10][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=10.272 g of 4-amino-3-mercapto-6-methyl-4H-1,2,4-triazin-5-one (which can be prepared by the method of A. Dornow, H. Menzel, P. Marx, Chem. Ber. 97, 2173 (1964)) was suspended in 0.86 ml of a 2N solution of sodium hydroxide in water. A solution of 0.218 g of benzyl chloride in ethanol was subsequently added dropwise, and the mixture was heated at 80° C. for 30 minutes. The resultant precipitate was filtered off with suction, giving 4-amino-3-benzylsulfanyl-6-methyl-4H-1,2,4-triazin-5-one.
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