[OH:1][C:2]1[C:7]([NH:8][C:9](=[O:20])[C:10]2[CH:15]=[C:14]([CH3:16])[C:13]([O:17][CH3:18])=[C:12]([CH3:19])[CH:11]=2)=[C:6]([OH:21])[N:5]=[C:4]([S-:22])[N:3]=1.[Na+].[OH-].[Na+].I[CH3:27].Cl>O.CN1CCCC1=O>[OH:21][C:6]1[C:7]([NH:8][C:9](=[O:20])[C:10]2[CH:11]=[C:12]([CH3:19])[C:13]([O:17][CH3:18])=[C:14]([CH3:16])[CH:15]=2)=[C:2]([OH:1])[N:3]=[C:4]([S:22][CH3:27])[N:5]=119.1 g of sodium 4,6-dihydroxy-5-(4-methoxy-3,5-dimethyl-benzoylamino)-pyrimidine-2-thiolate in 190 ml of water and 80 ml of N-methylpyrrolidin-2-one were cooled to 0° C. With cooling, 5.9 g of sodium hydroxide were added, and the mixture was then stirred at 0° C. for 30 min. Then a solution of 3.7 ml of iodomethane in 4.3 ml of N-methylpyrrolidin-2-one was added. After completion of the reaction (2 h), the mixture was acidified with concentrated hydrochloric acid. The resulting precipitate was isolated by suction, washed with water and dried in vacuo. 10.1 g of the title compound were obtained.
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