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The chiral centres in the dilactone moiety of the title compound, C13H14O5, are in the configuration 3S,6R. The ring itself has a somewhat flattened twist-boat conformation. C—H...O inter­actions join the mol­ecules into a two-dimensional network running parallel to the (101) plane.

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The chiral centres in the dilactone moiety of the title compound, C13H14O5, are in the configuration 3S,6S. The ring itself has a boat conformation. C—H...O inter­actions link the mol­ecules into a chain in the [010] direction.

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The lactide ring in the title compound, C12H12O5, adopts a screw-boat conformation. C—H...O inter­actions link the mol­ecules into a chain in the [100] direction.
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