The title compound, C21H21NO5, crystallizes with two molecules in the asymmetric unit. In each molecule, the central 1,4-dihydropyridine ring adopts a shallow sofa conformations (with the C atom bearing the phenol ring as the flap), whereas the pendant cyclohexene rings both have twisted-boat conformations. Each molecule features an intramolecular O—HO hydrogen bond, which closes an S(8) ring. In the crystal, the molecules are linked by O—HO, C—HO and C—H interactions, forming a three-dimensional network.