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2′,7′-difluoro-3′,6′-dihydroxy-3-oxo-3H-spiro[2-benzofuran-1,9′-xanthene]-6-carboxylic acid

2',7'-difluoro-3',6'-dihydroxy-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-6-carboxylic acid