E-Learning: An Experimental

R factor = 0.030; wR factor = 0.083; data-to-parameter ratio = 8.1. In the title compound, C13H10N4O5, the aromatic ring planes are close to perpendicular [dihedral angle = 75.94 (5)] and the C—N—N—C torsion angle is 88.7 (2). Both nitro groups lie close to their attached ring plane, with C—C—N—O torsion angles of 3.1 (2) and 5.3 (2). This allows for the formation of an intramolecular N—H O hydrogen bond, which closes an S(6) ring. In the crystal, N—H O hydrogen bonds link the molecules into zigzag chains extending along [100]