Received 13 November 2008
The asymmetric unit of the title compound, C17H11Cl3N2O2, contains two independent molecules; the pyrazole rings are oriented with respect to the chlorophenyl and dichlorophenyl rings at dihedral angles of 43.00 (3) and 65.06 (4)°, respectively, in one molecule, and 51.17 (3) and 69.99 (3)°, respectively, in the other. Pairs of intermolecular O-HO hydrogen bonds link the molecules into dimers. In the crystal structure, there are - contacts between the pyrazole rings and dichlorophenyl rings [centroid-centroid distances = 3.859 (3) and 3.835 (3) Å].
Data collection: CAD-4 Software (Enraf-Nonius, 1989); 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: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HK2574 ).
The authors thank the Center for Testing and Analysis, Nanjing University, for the support.
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 (1989). CAD-4 Software. Enraf-Nonius, Delft, The Netherlands.
Harms, K. & Wocadlo, S. (1995). XCAD4. University of Marburg, Germany.
North, A. C. T., Phillips, D. C. & Mathews, F. S. (1968). Acta Cryst. A24, 351-359.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Spek, A. L. (2003). J. Appl. Cryst. 36, 7-13.
Tang, L. H., Tao, L, Chen, H. B. & Zhong, B. H. (2007). Chin. J. Pharm. 38, 252-254.