[OH-].[Li+].[Br:3][C:4]1[NH:8][C:7]([C:9]([O:11]C)=[O:10])=[C:6](/[CH:13]=[CH:14]/[O:15][CH3:16])[N:5]=1.Cl>O.O1CCCC1>[Br:3][C:4]1[NH:8][C:7]([C:9]([OH:11])=[O:10])=[C:6](/[CH:13]=[CH:14]/[O:15][CH3:16])[N:5]=1A solution of 2.20 g lithium hydroxide in 175 ml of water is added to a solution of 3.50 g methyl 2-bromo-5-(trans-2-methoxy-vinyl)-3H-imidazole-4-carboxylate in 140 ml of tetrahydrofuran. The solution is stirred for 4 h at ambient temperature. Then 92 ml aqueous 1 M hydrochloric acid are added, and the solution is cooled in the ice bath. The precipitate is separated off, washed with water and dried.
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