Received 8 December 2010
The asymmetric unit of the title compound [systematic name: 9,10-dimethoxy-7-methyl-6,7,7a,8-tetrahydro-5H-benzo[g][1,3]benzodioxolo[6,5,4-de]quinoline], C20H21NO4, contains two independent molecules with very similar bond lengths and angles. The crystal packing exhibits voids of 131 Å3.
For related structures, see: Israilov et al. (1980); Blanchfield et al. (2003). For the chemistry, pharmacology and traditional uses of the title compound, see; Montririttigri et al. (2008) and Semwal et al. (2010).
Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); 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, 1997); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HG2768 ).
The authors thank Dr Narongsuk Chaichit, Department of Physics, Faculty of Science, Thammasart University, for the data collection and the Department of Chemistry, Faculty of Science, Kasetsart University, for financial support.
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