Crystal structure of 4′-bromo-2,5-dihy­dr­oxy-2′,5′-dimeth­­oxy-[1,1′-biphen­yl]-3,4-dicarbo­nitrile

In the crystal of the title substituted hemibi­quinone derivative, C16H11BrN2O4 or [BrHBQH2(CN)2], the substituted benzene rings are rotated about the central C—C bond, forming a dihedral angle of 53.59 (7)°. The ring systems inter­act through an intra­molecular O—H⋯Ometh­oxy hydrogen bond, which induces a geometry quite different from those in previously reported hemibi­quinone structures. In the crystal, the mol­ecules associate through an inter­molecular O—H⋯Nnitrile hydrogen bond, forming chains which extend along [100] and are inter­linked through very weak C—H⋯N hydrogen bonds, giving a overall two-dimensional structure lying parallel to (010).