Hydrochloric Acid → N-[4-(2-{4-[(aminocarbonothioyl)amino]phenyl}ethyl)-1,3-thiazol-2-yl]acetamide

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A mixture of N-{4-[2-(4-{[(benzoylamino)carbonothioyl]amino}phenyl)ethyl]-1,3-thiazol-2-yl}acetamide (200 mg), 6N aqueous sodium hydroxide (0.19 ml) and ethanol (2 ml) was stirred at 60° C. for 2 hours. The reaction mixture was cooled to ambient temperature and neutralized with 1N hydrochloric acid (1.2 ml). The precipitated crystals were filtered and washed with water to give N-[4-(2-{4-[(aminocarbonothioyl)amino]phenyl}ethyl)-1,3-thiazol-2-yl]acetamide (120 mg).

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