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The title compound, C18H22O6, was obtained by the domino oxa–Michael–aldol (DOMA) reaction and has the cyclohexanone ring in a chair conformation with intra-annular torsion angles in the range 49.9 (2)–58.9 (2)°. The two ethoxycarbonyl substituents on the cyclohexanone ring adopt a syn configurations. In the crystal, the molecules self-assemble through duplex intermolecular hydroxy–carbonyl O—H...O hydrogen bonds, giving centrosymmetric cyclic dimers [graph set R22(12)] which inter-associate through weak C—H...O hydrogen-bonding interactions.