In the title compound, C(20)H(15)N(3)O(3)S, the thia-zole ring is approximately planar, with a maximum deviation of 0.003 (1) Å, and makes dihedral angles of 7.44 (6) and 1.88 (6)° with the hy-droxy-substituted phenyl ring and the pyran ring, respectively. The hydroxyl group is disordered over two sets of sites, with an occupancy ratio of 0.567 (3):0.433 (3). In the crystal, the major disorder component mol-ecules are connected via bifurcated (three-centre) O-H⋯O and C-H⋯O hydrogen bonds, generating R(1) (2)(6) motifs and resulting in supra-molecular chains along the a axis. In the minor occupancy component, however, mol-ecules are connected via C-H⋯O hydrogen bonds, forming supra-molecular chains along the b axis. Furthermore, the crystal structure is stabilized by π-π inter-actions between the thia-zole rings [centroid-centroid distance = 3.5476 (7) Å].