[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]=1
19.1 g of sodium 4,6-dihydroxy-5-(4-methoxy-3,5-dimethylbenzoylamino)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, after which the mixture was stirred at 0° C. for 30 min. A solution of 3.7 ml of iodomethane in 4.3 ml of N-methylpyrrolidin-2-one was then added. After the reaction had ended (2 h), the mixture was acidified with concentrated hydrochloric acid. The precipitate obtained was filtered off with suction, washed with water and dried under reduced pressure. This gave 10.1 g of the title compound.
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