[O:1]=[C:2]1[CH2:6][CH2:5][CH2:4][N:3]1[C:7]1[CH:17]=[CH:16][CH:15]=[CH:14][C:8]=1[C:9]([O:11]CC)=[O:10].[OH-].[Na+].Cl>CO>[O:1]=[C:2]1[CH2:6][CH2:5][CH2:4][N:3]1[C:7]1[CH:17]=[CH:16][CH:15]=[CH:14][C:8]=1[C:9]([OH:11])=[O:10]To a solution of ethyl 2-(2-oxopyrrolidin-1-yl)benzoate (4.3 g) in methanol (30 mL) was added 8 N aqueous sodium hydroxide solution (6.9 mL) at room temperature, and the mixture was heated to 50° C., and stirred overnight. The reaction mixture was allowed to cool to room temperature, and neutralized with 6 N aqueous hydrochloric acid solution (3 mL), and the solvent was evaporated under reduced pressure. The resultant crystals were recrystallized from ethanol to give the title compound (2.58 g).
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