[CH3:1]I.[NH2:3][C:4]([NH:6][C:7]1[CH:8]=[C:9]([CH:13]=[CH:14][CH:15]=1)[C:10]([OH:12])=[O:11])=[S:5]>O1CCCC1>[NH:3]=[C:4]([NH:6][C:7]1[CH:8]=[C:9]([CH:13]=[CH:14][CH:15]=1)[C:10]([OH:12])=[O:11])[S:5][CH3:1]Methyl iodide (18 g; 127.4 mmol; 7.93 ml) is added at ambient temperature, under an argon atmosphere, to a solution of 3-[(aminocarbothioyl)amino]benzoic acid (25 g; 127.4 mmol) in 375 ml of anhydrous tetrahydrofuran, and then the reaction mixture is heated at 75° C. for 2 hours. After cooling and concentration, the residue is taken up in ether and the precipitate formed is filtered off to yield the expected product.
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