Acta Cryst. (2013). E69, o1333 [ doi:10.1107/S1600536813019892 ]
Abstract: The asymmetric unit of the triclinic polymorph of the title compound, C21H25N3O3, consists of two molecules, whereas for the monoclinic polymorph Z' = 1 [Fun et al. (2009). Acta Cryst. E65, o445]. The two molecules exhibit an E configuration with respect to the C=N bond. The molecules are linked into dimers by N-HO and C-HO hydrogen bonds forming R22(8) ring motifs. In addition, - interactions occur between nitrophenyl groups [minimum centroid-centroid distance 3.940 (2) Å], stacking the molecules along the ac plane.
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