N'-[(E)-1-(2-hydroxyphenyl)ethylidene]pyrazine-2-carbohydrazide

The title compound, C₁₃H₁₂N₄O₂, 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].