Crystal structure of 5-[(benzo­yloxy)meth­yl]-5,6-dihy­droxy-4-oxo­cyclo­hex-2-en-1-yl benzoate

The crystal structure of the natural product zeylenone, C(21)H(18)O(7), was confirmed by single-crystal X-ray diffraction. The crystal structure has three chiral centers at positions C1, C5 and C6 of the cyclo­hexa­none ring, but the absolute configuration could not be determined reliably. The methyl benzoate and benzo­yloxy substituents at positions C1 and C5 of the cyclo­hexenone ring are on the same side of the ring with the dihedral angle between their mean planes being 16.25 (10)°. These rings are almost perpendicular to the cyclo­hexenone ring. The benzoate groups and two hydroxyl groups on the cyclo­hexenone ring form strong hydrogen bonds to consolidate the crystal structure. In addition, weak C—H⋯O hydrogen bonds also contribute to the packing of the structure.