O.[OH-].[Li+:3].[N:4]1([C:10]2[N:11]=[C:12]([CH2:17][C:18]([O:20]CC)=[O:19])[NH:13][C:14](=[O:16])[CH:15]=2)[CH2:9][CH2:8][O:7][CH2:6][CH2:5]1>CO>[N:4]1([C:10]2[N:11]=[C:12]([CH2:17][C:18]([O-:20])=[O:19])[NH:13][C:14](=[O:16])[CH:15]=2)[CH2:5][CH2:6][O:7][CH2:8][CH2:9]1.[Li+:3]7.5 ml of water and 197 mg of lithium hydroxide are added to a solution of 2 g of ethyl [4-(morpholin-4-yl)-6-oxo-1,6-dihydropyrimidin-2-yl]acetate prepared in stage 1 of Example 1 in 75 ml of methanol. After stirring for 48 hours at ambient temperature, the reaction mixture is concentrated under reduced pressure. 50 ml of water are added. The aqueous phase is then washed with ethyl acetate and then lyophilized. 1.73 g of lithium [4-(morpholin-4-yl)-6-oxo-1,6-dihydropyrimidin-2-yl]acetate are obtained in the form of a white solid, the characteristics of which are similar to the product of stage 2.
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