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In the title compound, C16H18N4O4, the mol­ecule assumes an E conformation with respect to the N=N double bond. The aromatic rings are not coplanar, with a dihedral angle of 7.51 (8)°. The nitro group is tilted by 4.71 (11)° relative to the attached benzene ring. In the crystal, mol­ecules are connected through O—H...O hydrogen bonds forming a double-stranded chain parallel to the b axis.

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In the title compound, C22H16N2O6, the naphthalene ring systems form a dihedral angle of 65.2 (1)°. Two O atoms of one of the nitro groups are disordered over two sets of sites with occupancy factors of 0.586 (15) and 0.414 (15). Weak C—H...O inter­molecular inter­actions are present, forming a ladder like structure along the a axis.
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