In the title mol-ecule, C(17)H(16)N(2)O(3)S, the benzothia-zole fragment and the benzene ring form a dihedral angle of 13.8 (4)°, and an intramolecular O-H⋯N hydrogen bond occurs. In the crystal structure, pairs of weak inter-molecular O-H⋯S and C-H⋯(O,O) hydrogen bonds link mol-ecules into centrosymmetric dimers. These dimers are related by translation along the a axis and form stacks via π-π inter-actions, with a short inter-molecular distance of 3.766 (5) Å between the centroids of the benzene and thia-zole rings.