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The asymmetric unit of the title 1:2 adduct, C 12 H 10 N 4 ·2C 8 H 8 O 2 , comprises a single mol­ecule of 2-phenyl­acetic acid and half a mol­ecule of 3-pyridine­aldazine; the latter is completed by crystallographic inversion symmetry. In the crystal, mol­ecules are connected into a three-component aggregate  via  O—H⋯N hydrogen bonds. As the carboxyl group lies above the plane through the benzene ring to which it is attached [C—C—C—C = 62.24 (17)°] and the 4-pyridine­aldazine mol­ecule is almost planar (r.m.s. deviation of the 16 non-H atoms = 0.027 Å), the overall shape of the aggregate is that of a flattened extended chair. Layers of these aggregates are connected by C—H⋯O and C—H⋯π inter­actions and stack parallel to (220).

2-Phenylacetic acid–3-{(E)-2-[(E)-pyridin-3-ylmethylidene]hydrazin-1-ylidenemethyl}pyridine (2/1)