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The title compound, C 16 H 10 O 5 , consists of two isobenzofuran-1(3 H )-one moieties which are linked by a bridging O atom. The two halves of the mol­ecule display approximate non-crystallographic mirror symmetry. The dihedral angle between the two isobenzofuran-1(3 H )-one ring systems is 53.18 (6) Å. Two chiral carbon centres are observed in the compound, but their absolute configurations could not be determined. In the crystal structure, inter­molecular C—H⋯O hydrogen bonds link mol­ecules into zigzag chains along  c . Additional C—H⋯O inter­actions connect adjacent chains.

3,3′-Oxybi[isobenzofuran-1(3H)-one]