Acetic Acid → 3-Carboxy-2-methylthio-4-oxo-6,7,8-trifluoro-4H-1-benzothiopyran

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A mixture of 300 mg (0.897 mmol) of the compound of Example 111, 0.54 ml of acetic acid, 0.072 ml of concentrated sulfuric acid and 0.36 ml of water was stirred for 3 hours at 100° C. After cooling by allowing to stand, the crystals deposited were collected by filtration, washed with water, and dried to obtain 147 mg (0.481 mmol) of title compound (yield 54%).

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