In the title compound, C(19)H(17)NO(4)S, the phenyl ring and the naphthalene ring system are oriented at a dihedral angle of 4.12 (2)° and the mol-ecule adopts a U-shaped conformation. The C(c)-C-N-S (c = carb-oxy) torsion angle is 90.98 (15)°. In the crystal, mol-ecules are linked by O-H⋯O and N-H⋯O hydrogen bonds, resulting in (100) chains incorporating centrosymmetric R(2) (2)(14) and R(2) (2)(10) loops. Weak aromatic π-π stacking is also observed [centroid-centroid separations = 3.963 (2) and 3.932 (2) Å].
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