Abstract
In the molecule of the title compound, C12H6N2O3S, the central heterocyclic ring is oriented at dihedral angles of 3.25 (6) and 2.28 (7)degrees with respect to the benzene and pyridine rings, respectively. The dihedral angle between the benzene and pyridine rings is 5.53 (7)degrees. In the crystal structure, intermolecular C-H center dot center dot center dot O hydrogen bonds link the molecules into chains.