4-{2-[(5-Chloro-2-hydroxy-benzyl-idene)amino]eth-yl}benzene-sulfonamide.

In the mol-ecule of the title compound, C(15)H(15)ClN(2)O(3)S, the S atom adopts a distorted tetra-hedral coordination geometry with two O atoms, one N atom of the amide group and one C atom of the aromatic ring. An intra-molecular O-H⋯N hydrogen bond results in the formation of a planar six-membered ring, which is oriented with respect to the adjacent aromatic ring at a dihedral angle of 3.38 (11)°. Thus, the two rings are nearly coplanar. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers.