[CH2:1]([O:3][C:4]1[CH:9]=[C:8]([C:10]([NH:12][CH2:13][CH3:14])=[O:11])[CH:7]=[CH:6][C:5]=1[N:15]1[CH:19]=[C:18]([C:20]([O:22]CC)=[O:21])[N:17]=[N:16]1)[CH3:2].[OH-].[Na+].O>C(O)C>[CH2:1]([O:3][C:4]1[CH:9]=[C:8]([C:10]([NH:12][CH2:13][CH3:14])=[O:11])[CH:7]=[CH:6][C:5]=1[N:15]1[CH:19]=[C:18]([C:20]([OH:22])=[O:21])[N:17]=[N:16]1)[CH3:2]To a solution of ethyl 1-{2-ethoxy-4-[(ethylamino)carbonyl]phenyl}-1H-1,2,3-triazole-4-carboxylate (0.51 g) obtained in Example 131e) in ethanol (8 ml) was added 8N aqueous sodium hydroxide solution (0.39 ml), and the mixture was stirred at room temperature for 5 hr. Water was added to the reaction mixture, and ethanol was evaporated under reduced pressure. Water was added to the obtained aqueous solution and the mixture was washed with ethyl acetate. 1N Hydrochloric acid was added to acidify the aqueous solution. The deposited precipitate was collected by filtration, washed with water and air-dried to give the title compound as a white powder (0.36 g, 76%).
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