4-[(E)-(5-Chloro-2-hydroxy-benzyl-idene)amino]benzene-sulfonamide.

In the mol-ecule of title compound, C(13)H(11)ClN(2)O(3)S, the aromatic rings are oriented at a dihedral angle of 12.27 (3)°. An intra-molecular O-H⋯N hydrogen bond results in the formation of a planar (mean deviation 0.0083 Å) six-membered ring, which is nearly coplanar with the adjacent ring at a dihedral angle of 2.36 (13)°. In the sulfonamide group, the S atom is 0.457 (3) Å from the plane through the O and N atoms. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules.