In the title compound, C(21)H(23)NO(4)S, the dihedral angle between the naphthalene residue and the benzene ring is 7.66 (3)°. In the molecule, there are some short C-H⋯O interactions. In the crystal, the structure is stabilized by weak intra-molecular C-H⋯O hydrogen bonds and the crystal structure is stabilized by weak C-H⋯O, C-H⋯π and π-π [centroid-centroid distance = 3.710 (2) Å] inter-actions.