Received 24 January 2013
In the title molecule, C13H11N3O6S, the dihedral angle between the benzene rings is 35.52 (8)°. An intramolecular N-HO hydrogen bond forms an S(6) ring. In the crystal, molecules are linked via N-HO hydrogen bonds into chains along  incorporating R22(8) and R22(16) rings.
Data collection: COLLECT (Nonius, 2000); cell refinement: SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO (Otwinowski & Minor, 1997) and SCALEPACK; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: WinGX (Farrugia, 2012).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH5580 ).
We are grateful to Dr Sihui Long for providing the help with the crystallization and also in editing this paper. We are grateful to Dr Judith Ann Gallucci for the X-ray crystallographic experiments.
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