Received 13 December 2010
aDepartment of Chemistry, Research Complex, Allama Iqbal Open University, Islamabad 44000, Pakistan,bDepartment of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA, and cDepartment of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
Correspondence e-mail: firstname.lastname@example.org
In the title compound, C16H14N2O5, a non-merohedral twin, the dihedral angle between the mean planes of the two benzene rings is 4.0 (9)°. The ethyl group is disordered [0.643 (14) and 0.357 (14) occupancy]. The nitro group is twisted by 16.4 (4)° from the mean plane of the benzene ring and the mean plane of the carbonyl group is twisted from the mean planes of the two benzene rings by 4.5 (0) and 4.7 (9)°. An intramolecular N-HO hydrogen bond occurs. The crystal packing is stabilized by weak intermolecular C-HO hydrogen-bond interactions.
For applications of amides and amide derivatives in the pharmaceutical industry, see: Banihashemi & Firoozifar (2003); Mallakpour & Kowsari (2005); Saxena et al. (2003); Wang et al. (2008). For standard bond lengths, see: Allen et al. (1987).
Data collection: CrysAlis PRO (Oxford Diffraction, 2007); cell refinement: CrysAlis RED (Oxford Diffraction, 2007); data reduction: CrysAlis RED; 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: PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HG2769 ).
RJB acknowledges the NSF MRI program (grant No. CHE-0619278) for funds to purchase an X-ray diffractometer.
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Oxford Diffraction (2007). CrysAlis PRO and CrysAlis RED. Oxford Diffraction Ltd, Abingdon, England.
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