Methyl 2-[(E)-(3-formyl-4-hydroxyphenyl)diazenyl]benzoate

The title compound, C15H12N2O4, displays a twisted conformation as reflected in the dihedral angle between the aromatic rings of 59.77 (7)°. Intra- and inter­molecular O—H⋯O inter­actions are found, with the latter leading to a double chain arranged about a zigzag chain of {O—H⋯O}n inter­actions.