Hexahydroxybenzene–2,2′-bipyridine (1/2)

2,2′-Bi­pyridine (2BPY) and hexa­hydroxy­benzene (HHB) crystallize in a 2:1 ratio as a neutral molecular adduct, C₆H₆O₆·2C₁₀H₈N₂, in space group P with Z = 1 and with the HHB molecule lying on an inversion centre. HHB, of which this is the first single-crystal X-ray structure determination, forms O—H?O hydrogen-bonded chains parallel to the a axis, with O?O distances of 2.761 (1) and 2.782 (1) Å. O—H?N hydrogen bonds to the 2BPY molecules crosslink these chains, with O?N distances of 2.707 (1) and 2.735 (1) Å.