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In the title compound, C 15 H 14 N 2 O 4 , the dihedral angle between the two benzene rings is 4.1 (2)°. The mol­ecule adopts an  E  configuration with respect to the C=N bond. There are intra­molecular O—H⋯N and O—H⋯O hydrogen bonds in the mol­ecule. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯O and O—H⋯O hydrogen bonds, forming chains running along the  c  axis.

N′-(2,5-Dihydroxybenzylidene)-2-hydroxy-3-methylbenzohydrazide