4-(5-Chloro-2-hydroxy­benzyl­idene­amino)-N-(4,6-dimethyl­pyrimidin-2-yl)benzene­sulfonamide

The title compound, C(19)H(17)ClN(4)O(3)S, is a Schiff base compound of 5-chloro­salicylaldehyde and sulfamethazine [4-amino-N-(4,6-dimethyl-2-pyrimidin­yl)benzene­sulfonamide]. The geometry around the S atom is distorted tetra­hedral, comprising two O atoms of the sulfonyl group, a C atom of a benzene ring and the amino N atom. The title compound has an intra­molecular O—H⋯N hydrogen bond and two inter­molecular C—H⋯O and N—H⋯O hydrogen bonds, which link neighbouring mol­ecules into 10-membered rings. As a result of an unavoidable conformational arrangement, a slightly short intra­molecular contact of distance 2.59 Å exists between an O atom of the sulfonyl group and an H atom of the sulfamethazine benzene ring.