5-[(E)-(5-Bromo-2-hydroxybenzylidene)amino]-1,3,4-thiadiazole-2(3H)-thione

In the title molecule, C9H6BrN3OS2, the dihedral angle between the benzene ring and the five-membered ring is 5.5 (3)°. An intramolecular O—H...N hydrogen bond forms an S(6) ring motif. In the crystal, N—H...S hydrogen bonds link molecules into centrosymmetric dimers creating R22(8) ring motifs. In addition, there are intermolecular S...S [3.430 (2) Å] contacts. The crystal used was a non-merohedral twin with a ratio of 0.113 (3):0.887 (3) for the components