[OH-].[Na+].CO.[C:5]([NH:13][C:14]1[CH:23]=[C:22]([O:24][CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[CH:21]=[CH:20][C:15]=1[C:16]([O:18]C)=[O:17])(=[O:12])[C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1>O1CCCC1>[C:5]([NH:13][C:14]1[CH:23]=[C:22]([O:24][CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[CH:21]=[CH:20][C:15]=1[C:16]([OH:18])=[O:17])(=[O:12])[C:6]1[CH:7]=[CH:8][CH:9]=[CH:10][CH:11]=10.11 mL of 2.0 mol/L aqueous sodium hydroxide was added dropwise to a mixed solution of 1 mL of methanol and 2 mL of tetrahydrofuran containing 70 mg of methyl 2-(benzamido)-4-(benzyloxy)benzoate at room temperature, and stirred at the same temperature for 6 hours and 30 minutes, at 40° C. for 1 hour and 30 minutes and at 50° C. for 2 hours. After the reaction mixture was cooled to room temperature, the solvent was evaporated under reduced pressure and water and diethyl ether were added. The aqueous layer was separated and pH was adjusted to pH 4.0 with 1.0 mol/L hydrochloric acid. A solid substance was separated by filtration to obtain 35 mg of 2-(benzamido)-4-(benzyloxy)benzoic acid as white solid.
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