Abstract
The solid state structure of a 1 : 1 homosulfanilamide : Sulfathiazole adduct was determined by single crystal X-ray diffraction. The results showed that the acidic proton of sulfathiazole is abstracted by the aminomethyl group of homosulfanilamide to form a salt. Intramolecular hydrogen bonds are also involved in the stabilization of this "molecular compound".