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In the title compound, C 26 H 20 N 6 O 4 , the two aroylhydrazone side groups exist as diastereomeres, both in the keto form in the crystal structure. The aroylhydrazone units support the mol­ecular conformation through an intra­molecular N—H⋯O hydrogen bond. Two mol­ecules are connected into a centrosymmetric dimer by inter­molecular N—H⋯N hydrogen bonds. These dimers are connected into chains along the  a  axis by inter­molecular O—H⋯O hydrogen bonds. The combination of these hydrogen bonds results in layers in the  bc  plane. The layers are further linked by weak C—H⋯π contacts to form a three-dimensional network structure.

N2,N2′-Bis(2-hydroxybenzylidene)-2,2′-bipyridyl-3,3′-dicarbohydrazide

N²,N^2′-Bis(2-hydroxybenzylidene)-2,2′-bipyridyl-3,3′-dicarbohydrazide