Experimental Crystal data

R factor = 0.033; wR factor = 0.087; data-to-parameter ratio = 10.0. The crystal structure of the title compound, C14H12N2O4, contains four crystallographically independent molecules in the asymmetric unit. All the molecules have similar conforma-tions; the dihedral angles between the aromatic rings are 33.1 (1), 33.76 (9), 31.41 (9) and 32.56 (10). Intramolecular O—H N hydrogen bonds form S(6) ring motifs in each molecule. In the crystal, there are two pairs of pseudo-inversion-related molecules. Along the c axis, molecules are stacked with – interactions between the 2-hydroxyphenyl and 4-methoxy-2-nitrophenyl rings [centroid–centroid distances = 3.5441 (12)–3.7698 (12) Å]. Related literatur