[Cl:1][C:2]1[CH:8]=[CH:7][CH:6]=[C:5]([S:9][C:10]2[C:15]([N+:16]([O-:18])=[O:17])=[CH:14][CH:13]=[CH:12][C:11]=2[Cl:19])[C:3]=1[NH2:4].[CH:20](O)=[O:21]>>[Cl:1][C:2]1[CH:8]=[CH:7][CH:6]=[C:5]([S:9][C:10]2[C:15]([N+:16]([O-:18])=[O:17])=[CH:14][CH:13]=[CH:12][C:11]=2[Cl:19])[C:3]=1[NH:4][CH:20]=[O:21]A solution of 2-chloro-6-(2-chloro-6-nitrophenylthio)aniline (689 mg, 2.18 mmol) in formic acid (5 mL) was heated at reflux for 16 hours. The mixture was allowed to cool to room temperature and the solvent was evaporated. The residue was used without purification.
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