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The title compound, C 18 H 16 BrN 3 O 4 S, is a Schiff base ligand of 5-bromo­salicylaldehyde and sulfisoxazole [or  N -(3,4-dimethyl-5-isoxazol)sulfanilamide]. The present structure is a zwitterion and is a more precise reinterpretation of the structure which was originally reported by Hämäläinen, Lehtinen & Turpeinen [ Arch. Pharm . (1986),  319 , 415–420]. The two aromatic rings which make π–π inter­actions [centroid–centroid distance 3.7538 (18) Å] through intermolecular interactions. There is also a C—Br⋯π inter­action [3.6333 (15) Å] with the heterocyclic ring. An intra­molecular N—H⋯O hydrogen bond also exists. Dimers are formed due to inter­molecular N—H⋯O hydrogen bonding. Inter­molecular C—H⋯O hydrogen bonding links a methyl C atom and the phenolate O atom. The dimers are linked by C—H⋯N hydrogen bonds, where the C atom is from the Schiff base group and the N atom is of five-membered heterocyclic ring.

4-Bromo-2-((E)-{4-[(3,4-dimethylisoxazol-5-yl)sulfamoyl]phenyl}iminiomethyl)phenolate