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The asymmetric unit of the title cocrystal, C 12 H 10 N 4 ·2C 7 H 6 O 2 , comprises a single mol­ecule of benzoic acid and one half-mol­ecule of 2-pyridine­aldazine situated about a centre of inversion. The carboxyl group is coplanar with the benzene ring to which it is connected [O—C—C—C = −172.47 (12)°] and similarly, the 2-pyridine­aldazine mol­ecule is planar (r.m.s. deviation of the 16 non-H atoms = 0.017 Å). In the crystal, mol­ecules are connected into a non-planar three-mol­ecule aggregate [dihedral angle between the benzene and pyridyl ring connected by the hydrogen bond = 61.30 (7)°] with a twisted Z-shape. Layers of 2-pyridine­aldazine mol­ecules in the  ab  plane are sandwiched by benzoic acid mol­ecules being connected by O—H⋯N and C—H⋯O inter­actions, the latter involving the carbonyl O atom so that each benzoic acid mol­ecule links three different 2-pyridine­aldazine mol­ecules. Inter­digitated layers stack along the  c  axis.

Benzoic acid–2-{(E)-[(E)-2-(2-pyridylmethylidene)hydrazin-1-ylidene]methyl}pyridine (2/1)