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Consideration of a previous unrecognized twinning of the original investigated crystal of the title compound [Kia et al. (2009 ). Acta Cryst. E65, o301] led to improved reliability factors and to a slightly higher precision for all geometric parameters. The crystal under investigation was twinned by pseudo-merohedry with [100, 00, 00] as the twin matrix and a refined twin domain fraction of 0.9610 (5):0.0390 (5). The results of the new crystal structure refinement are given here.
Data collection: APEX2 (Bruker, 2005 ); cell refinement: SAINT (Bruker, 2005 ); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 ); program(s) used to refine structure: SHELXTL (Sheldrick, 2008 ); molecular graphics: SHELXTL (Sheldrick, 2008 ); software used to prepare material for publication: SHELXTL (Sheldrick, 2008 ) and PLATON (Spek, 2009 ).
Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536809018790/wm2233sup1.cif
Structure factors: contains datablocks I. DOI: 10.1107/S1600536809018790/wm2233Isup2.hkl
The molecular structure of the title compound showing the atom labels and 50% probability displacement ellipsoids for non-H atoms.
a c. DOI: 10.1107/S1600536809018790/wm2233fig2.tif
The crystal packing of the title compound, viewed down the a axis, showing the one-dimensional infinite chain along the c axis formed by intermolecular N—HN and C—HN interactions. The intermolecular interactions are shown as dashed lines.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WM2233).