(Z)-3-(2-{2-[1-(4-Hydroxyphenyl)ethylidene]hydrazin-1-yl}-1,3-thiazol-4-yl)-2H-chromen-2-one

In the title compound, C(20)H(15)N(3)O(3)S, an intramolecular C-H center dot center dot center dot O hydrogen bond generates an S(6) ring motif. The chromene ring system is inclined at dihedral angles of 14.21 (9) and 9.91 (10)degrees, respectively, with respect to the thiazole and benzene rings. The thiazole ring makes a dihedral angle of 24.06 (11)degrees with the benzene ring. In the crystal structure, O-H center dot center dot center dot O hydrogen bonds link the molecules into a zigzag chain along [20 (1) over bar]. Weak N-H center dot center dot center dot O and C-H center dot center dot center dot O interactions connect the chains into a three-dimensional network. pi-pi stacking interactions with a centroid-centroid distance of 3.4209 (14) angstrom are also observed between the chains.