[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH:8]1[CH2:17][C:16](=O)[C:11]2[C:12]([CH3:15])=[CH:13][S:14][C:10]=2[CH2:9]1.[C:19]([NH:22][NH2:23])([NH2:21])=[NH:20].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[CH2:17][C:16](=[N:23][NH:22][C:19]([NH2:21])=[NH:20])[C:11]2[C:12]([CH3:15])=[CH:13][S:14][C:10]=2[CH2:9]1A mixture of 6-(2-chlorophenyl)-3-methyl-4,5,6,7-tetrahydrobenzothiophene-4-one (0.07 g), aminoguanidine hydrochloride (0.034 g), concentrated hydrochloric acid (0.063 ml), water (0.063 ml) and ethanol (10 ml) was refluxed for 4 hours. Under reduced pressure, the solvent was evaporated, and the residue was recrystallized from ethanol to give 6-(2-chlorophenyl)-4-guanidinoimino-3-methyl-4,5,6,7-tetrahydrobenzothiophene hydrochloride (Compound 117) (80 mg) as colorless crystals.
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