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The crystal of the title compound, 0.6C 14 H 12 N 2 O 3 ·0.4C 14 H 12 N 2 O 3 , contains a mixture of its neutral (OH containing) and zwitterionic (NH containing) forms, in a 0.60 (4):0.40 (4) ratio. The former generates an  S (6) loop  via  an intra­molecular O—H⋯N hydrogen bond and the latter generates an  S (6) loop  via  an N—H⋯O hydro­gren bond. The aromatic rings are oriented at a dihedral angle of 42.52 (10)°. In the crystal, C—H⋯π inter­actions occur and aromatic π–π stacking inter­actions [centroid–centroid separations = 3.7106 (12) and 3.9177 (13) Å] consolidate the packing.

2-{(E)-[(4-Methylphenyl)imino]methyl}-4-nitrophenol–2-{(E)-[(4-methylphenyl)iminio]methyl}-4-nitrophenolate (0.60/0.40)