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In the title compound, C 16 H 10 O 6 , the complete mol­ecule is generated by a crystallographic centre of symmetry. In the crystal, O—H⋯O hydrogen bonds link the mol­ecules into (100) sheets and C—H⋯O links also occur.

(1R,1′S)-1,1′-Dihydroxy-1,1′-biisobenzofuran-3,3′(1H,1′H)-dione