Acta Cryst. (2014). E70, o28 [ doi:10.1107/S1600536813032704 ]
Abstract: In the title molecule, C12H8N2O2, the nitro group is tilted slightly with respect to the carbazole moiety [angle between the least-squares planes = 4.43 (9)°]. In the crystal, the molecules are connected via pairs of N-HO hydrogen bonds into dimers with -1 symmetry. The dimers in turn are arranged into layers parallel to (10-1).
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