3,3-Bis(hydroxyaryl)-2-benzofuran-1(3H)-ones generally derived from the condensation of phthalic anhydride with phenols. Cf. xanthene dyes. E.g. 
phenolphthalein.
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3,3-Bis(hydroxyaryl)-2-benzofuran-1(3H)-ones generally derived from the condensation of phthalic anhydride with phenols. Cf. xanthene dyes. E.g. phenolphthalein.