N′-[(E)-1-(2-Hy­droxy­phen­yl)ethyl­idene]pyrazine-2-carbohydrazide

The title compound, C(13)H(12)N(4)O(2), crystallized with two independent mol­ecules (A and B) in the asymmetric unit. Mol­ecule B is planar to within 0.044 (3) Å for all non-H atoms, while mol­ecule A is slightly twisted, with a dihedral angle of 6.29 (4)° between the mean planes of the pyrazine-2-carbohydrazide and 1-(2-hy­droxy­phen­yl)ethanone moieties (r.m.s. deviations = 0.0348 and 0.0428 Å, respectively). S(5) and S(6) ring motifs are formed in both mol­ecules due to the presence of intra­molecular O—H⋯N and N—H⋯N hydrogen bonds. In the crystal, mol­ecules A and B are linked by a C—H⋯O hydrogen bond. They stack along the a-axis direction, forming columns with π–π inter­actions involving inversion-related pyrazine and benzene rings [centroid–centroid distances = 3.5489 (13)–3.8513 (16) Å].