In the title compound, C(36)H(32)N(2)O(4)S, the piperidine ring adopts a chair conformation, while the five-membered pyrrolidine (with a C atom as the flap atom) and thia-zolidine (with the S atom as the flap atom) rings adopt envelope conformations. The naphthalene ring system makes dihedral angles of 18.82 (5) and 40.92 (5)° with the two meth-oxy-substituted benzene rings. In the crystal, centrosymmetrically-related mol-ecules are linked into dimers via pairs of C-H⋯O and C-H⋯N hydrogen bonds. An intra-molecular O-H⋯N hydrogen bond is also observed. The crystal structure is further stabilized by C-H⋯π inter-actions.