[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:10]=[C:11]([C:14]([OH:16])=O)[NH:12][N:13]=1.O.[NH2:18][NH2:19]>CO.S(=O)(=O)(O)O>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:10]=[C:11]([C:14]([NH:18][NH2:19])=[O:16])[NH:12][N:13]=1In methanol (20 ml), 5-(2,4-dichlorophenyl)-2H-pyrazole-3-carboxylic acid (1.00 g) was dissolved, and 6 drops of concentrated sulfuric acid was added thereto. The mixture was heated under reflux for 19 hours. After the mixture was allowed to cool, hydrazine monohydrate (0.97 g) was added to the mixture, and the resulting mixture was heated under reflux for 16 hours. The mixture was concentrated under a reduced pressure, and water was added thereto. The precipitated crystal was separated by filtration, washed with water, and dried to give the title compound (912 mg, 87%) as a white powder.
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