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The mol­ecule of the title compound, C 14 H 14 N 4 O 2 , is slightly twisted, with a dihedral angle of 10.06 (14)° between the aromatic rings. An intra­molecular N—H⋯O and an inter­molecular O—H⋯O hydrogen bond help to establish the crystal structure.

2-Hydroxy-N′-[1-(3-methylpyrazin-2-yl)ethylidene]benzohydrazide