Received 22 November 2012
aDepartment of Studies and Research in Chemistry, Tumkur University, Tumkur 572 103, Karnataka, India,bDepartment of Physics, Yuvaraja's College (Constituent College), University of Mysore, Mysore 570 005, Karnataka, India,cRaman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bangalore 560 080, Karnataka, India, and dSoild State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, Karnataka, India
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The asymmetric unit of the title compound, C14H11NO5, contains two independent molecules in which the dihedral angles between the benzene rings are 89.27 (16) and 77.14 (12)°. In the crystal, molecules are linked by O-HO hydrogen bonds, generating C(8) chains propagating in  for one molecule and  C(8) chains for the other. The chains are connected by C-HO hydrogen bonds and - interactions [shortest centroid-centroid distance = 3.5908 (12)°], generating a three-dimensional network.
Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB6999 ).
The authors thank Professor T. N. Guru Row, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, and G. B. Sadananda, Department of Studies and Research in Physics, U.C.S. Tumkur University, Tumkur for their help and suggestions.
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