[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH:8]1[CH2:16][C:15]2[NH:14][N:13]=[C:12]([CH2:17][CH3:18])[C:11]=2[C:10](=O)[CH2:9]1.[C:20]([NH:23][NH2:24])([NH2:22])=[NH:21].Cl.Cl.O>C(O)C>[ClH:1].[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH:8]1[CH2:16][C:15]2[NH:14][N:13]=[C:12]([CH2:17][CH3:18])[C:11]=2[C:10](=[N:24][NH:23][C:20]([NH2:22])=[NH:21])[CH2:9]1A mixture of 6-(2-chlorophenyl)-3-ethyl-4,5,6,7-tetrahydroindazol-4-one (0.44 g), aminoguanidine hydrochloride (0.19 g), concentrated hydrochloric acid (0.24 ml), water (0.24 ml) and ethanol (40 ml) was refluxed for 4 hours. Under reduced pressure, the solvent was evaporated. The resulting crystals were recrystallized from ethanol-water to give 6-(2-chlorophenyl)-3-ethyl-4-guanidinoimino-4,5,6,7-tetrahydroindazole hydrochloride (Compound 27) (0.6 g) as colorless crystals.
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