Received 14 September 2009
In the title compound, C18H18N2O4, the nitro group, a methyl group, the acetyl group and some atoms of the dihydroquinolinone group are disordered over two sites with the ratio of occupancies fixed at 0.57:0.43. The relationship between the major and minor components of disorder is that of diastereomers. In the crystal structure, intermolecular N-HO, weak C-HO and C-H interactions link the molecules into two-dimensional layers running parallel to the (010) plane.
Data collection: SMART (Bruker, 2001); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH2906 ).
The authors thank Kashgar Teachers? College for financial support.
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