Received 19 March 2011
In the crystal structure of the title compound, C14H12O4, the molecules form classical O-HO hydrogen-bonded carboxylic acid dimers. These dimers are linked by C-Hpi; interactions into a three-dimensional network. The benzene rings are oriented at a dihedral angle of 69.6 (3)°.
For applications of the title compound, see: Jackson et al. (1993); Gapinski et al. (1990). For related structures, see: Shi et al. (2011); Raghunathan et al. (1982). For the synthesis of the title compound, see: Pellón et al. (1995). For bond-length data, see: Allen et al. (1987).
Data collection: CAD-4 Software (Enraf-Nonius, 1985); cell refinement: CAD-4 Software; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HG5013 ).
The author gratefully acknowledges financial support from the Natural Science Foundation of the Education Department of Shaanxi Provincial Government (09JK844) and is grateful for support provided by the key industry problem plan of Yulin (gygg200807) and the special research projects of Yulin University (08YK17).
Allen, F. H., Kennard, O., Watson, D. G., Brammer, L., Orpen, A. G. & Taylor, R. (1987). J. Chem. Soc. Perkin Trans.2, pp. S1-19.
Enraf-Nonius (1985). CAD-4 Software. Enraf-Nonius, Delft, The Netherlands.
Gapinski, D. M., Mallett, B. E., Froelich, L. L. & Jackson, W. T. (1990). J. Med. Chem. 33, 2798-2807.
Harms, K. & Wocadlo, S. (1995). XCAD4. University of Marburg, Germany.
Jackson, W. T., Boyd, R. J., Froelich, L. L., Gapinski, D. M., Mallett, B. E. & Sawyer, J. S. (1993). J. Med. Chem. 36, 1726-1734.
North, A. C. T., Phillips, D. C. & Mathews, F. S. (1968). Acta Cryst. A24, 351-359.
Pellón, R. F., Carrasco, R., Milián, V.& Rodes, L. (1995). Synth. Commun. 25, 1077-1083.
Raghunathan, S., Chandrasekhar, K. & Pattabhi, V. (1982). Acta Cryst. B38, 2536-2538.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Shi, L., Zhang, Q., Xiao, Q., Wu, T. & Zhu, H.-J. (2011). Acta Cryst. E67, o748.