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In the title compound, C20H13N5O2, the two pyrazine rings are nearly coplanar with the central pyridine ring, forming dihedral angles of 2.21 (9) and 4.57 (9)°. In contrast, the strong steric hindrance caused by the ortho-carboxyl group on the phenyl ring makes this ring rotate out of the attached pyridine ring plane by 52.60 (9)°. The carboxyl group is twisted from the phenyl ring by 22.6 (1)°. In the crystal, aromatic π-π stacking inter-actions [centroid-centroid distances = 3.9186 (4) and 3.9794 (5) Å] occur between the anti-parallel mol-ecules, generating infinite chains along [100]. O-H⋯O hydrogen bonds connect the chains, leading to the formation of a two-dimensional supra-molecular network parallel to (010). Inter-molecular C-H⋯N hydrogen bonds are also observed.

2-[2,6-Bis(pyrazin-2-yl)pyridin-4-yl]benzoic acid