Acta Cryst. (2013). E69, o705 [ doi:10.1107/S1600536813009197 ]
Abstract: In the title Schiff base, C21H14N4O4, the dihedral angle between the two nitro groups and the central benzene ring are 83.6 (5) and 2.6 (6)°. The anthracene ring system and the benzene ring make a dihedral angle of 0.7 (2)°. Intramolecular N-HO and C-HN hydrogen bonds occur. In the crystal, C-HO hydrogen bonds link the molecules, forming chains along the b-axis direction.
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