[F:1][C:2]1[CH:3]=[C:4]([C:8]2[C:12]3=[N:13][C:14](C#N)=[CH:15][CH:16]=[C:11]3[NH:10][N:9]=2)[CH:5]=[CH:6][CH:7]=1.S(=O)(=O)(O)O.[C:24](=[O:27])([O-])[OH:25].[Na+]>O.C(O)(=O)C>[F:1][C:2]1[CH:3]=[C:4]([C:8]2[C:12]3=[N:13][C:14]([C:24]([OH:25])=[O:27])=[CH:15][CH:16]=[C:11]3[NH:10][N:9]=2)[CH:5]=[CH:6][CH:7]=1140 mg of 3-(3-fluorophenyl)-1H-pyrazolo[4,3-b]-pyridine-5-carbonitrile was added to a mixed solution of 1 mL water, 1 mL concentrated sulfuric acid and 1 mL glacial acetic acid, and heated under 100° C. for 3 hours. The reaction solution was added with 25 mL of ice-cooled water, neutralized with sodium hydrogen carbonate, and the precipitated crystals were collected by filtration. The crystals collected by filtration were washed with cold water, and dried under reduced pressure, to give 150 mg of a crude product of the title compound as a colorless powder.
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