(E)-1-(2,4-Di­nitro­phen­yl)-2-(3-eth­oxy-4-hy­droxy­benzyl­idene)hydrazine

The mol­ecule of the title hydrazine derivative, C15H14N4O6, is essentially planar, the dihedral angle between the substituted benzene rings being 2.25 (9)°. The eth­oxy and hy­droxy groups are almost coplanar with their bound benzene ring [r.m.s. deviation = 0.0153 (2) A for the ten non-H atoms]. Intra­molecular N—H⋯O and O—H⋯Oeth­oxy hydrogen bonds generate S(6) and S(5) ring motifs, respectively. In the crystal, mol­ecules are linked by O—H⋯Onitro hydrogen bonds into chains propagating in [010]. Weak aromatic π–π inter­actions, with centroid–centroid distances of 3.8192 (19) and 4.0491 (19) A, are also observed.