[Cl:1][C:2]1[S:3][C:4]([Cl:19])=[CH:5][C:6]=1[CH:7]1[CH2:16][C:15]2[N:14]=[CH:13][CH:12]=[C:11]([CH3:17])[C:10]=2[C:9](=O)[CH2:8]1.[C:20]([NH:23][NH2:24])([NH2:22])=[NH:21].Cl.Cl>C(O)C>[ClH:1].[Cl:1][C:2]1[S:3][C:4]([Cl:19])=[CH:5][C:6]=1[CH:7]1[CH2:16][C:15]2[N:14]=[CH:13][CH:12]=[C:11]([CH3:17])[C:10]=2[C:9](=[N:24][NH:23][C:20]([NH2:22])=[NH:21])[CH2:8]1A mixture of 7-(2,5-dichlorothiophene-3-yl)-4-methyl-5,6,7,8-tetrahydroquinolin-5-one (218 mg), aminoguanidine hydrochloride (83 mg) and concentrated hydrochloric acid (0.1 ml) in ethanol (4 ml) was stirred at 100° C. (bath temperature) for 14 hours. The reaction solution was cooled, and precipitated crystals were filtered, washed with ethanol and dried to give 7-(2,5-dichlorothiophene-3-yl)-5-guanidinoimino-4-methyl-5,6,7,8-tetrahydroquinoline hydrochloride (Compound 102) (250 mg) as pale yellow crystals.
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