2-(Naphthalene-2-sulfonamido)-3-phenyl­propanoic acid

In the title compound, C₁₉H₁₇NO₄S, the phenyl ring and the naphthalene ring system are oriented at a dihedral angle of 4.12 (2)° and the mol­ecule adopts a U-shaped conformation. The C_c—C—N—S (c = carb­oxy) torsion angle is 90.98 (15)°. In the crystal, mol­ecules are linked by O—H...O and N—H...O hydrogen bonds, resulting in (100) chains incorporating centrosymmetric R²₂(14) and R²₂(10) loops. Weak aromatic π–π stacking is also observed [centroid–centroid separations = 3.963 (2) and 3.932 (2) Å].