[NH2:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)[N:5]=[C:4]([C:13]([O:15]CC)=[O:14])[CH:3]=1.[OH-].[Na+]>CCO>[NH2:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)[N:5]=[C:4]([C:13]([OH:15])=[O:14])[CH:3]=12 g (8.65 mmol) of ethyl 5-amino-1-phenyl-1H-pyrazole-3-carboxylate are dissolved in 20 ml EtOH and 20 ml of 1M NaOH solution are added. The mixture is stirred overnight, the solvent removed in vacuo and the crude product subject to HPLC chromatography: Yield: 65%
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