[Cl:1][C:2]1[CH:10]=[C:9]([C:11]([O:13]C)=[O:12])[CH:8]=[C:7]([Cl:15])[C:3]=1[C:4]([OH:6])=[O:5].[OH-].[Na+].O.O1CCC[CH2:20]1>Cl.C(OCC)(=O)C>[CH3:20][O:6][C:4](=[O:5])[C:3]1[C:2]([Cl:1])=[CH:10][C:9]([C:11]([OH:13])=[O:12])=[CH:8][C:7]=1[Cl:15]The mixture of 560 mg of 2,6-dichloro-4-methoxycarbonyl benzoic acid, 85 mg of sodium hydroxide, 5 ml of water and 5 ml of tetrahydrofuran was stirred for 1 hour. The mixture was diluted with 1N hydrochloric acid and treated by an ordinary method using ethyl acetate as an extractant to obtain the title compound.
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