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

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).