Interpenetrating supramolecular lattices in 4,4′-bi­pyridine–2,3,5,6-tetra­hydroxy-1,4-benzo­quinone (3/2)

4,4′-Bi­pyridine (BPY) and 2,3,5,6-tetra­hydroxy-1,4-benzo­quinone (THBQ) crystallize in a 3:2 ratio as a neutral molecular adduct, 3C₁₀H₈N₂·2C₆H₄O₆, in space group P. There are two independent and centrosymmetric THBQ mol­ecules and two different BPY mol­ecules in the asymmetric unit, one of which lies about an inversion centre. The molecules link together through O—H⃛O and O—H⃛N hydrogen bonds to form three interpenetrating networks which create a `superlattice' of three times the volume of the primitive cell.