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The title compound, C 16 H 12 O 6 , is a common impurity of  ortho -acetyl­salicylic acid (aspirin). The benzene rings form a dihedral angle of 81.9 (1)° while the acetyl and carboxyl groups form dihedral angles of 74.0 (1) and 26.4 (2)°, respectively, with the benzene rings to which they are bound. In the crystal, mol­ecules are linked by pairs of O—H⋯O hydrogen bonds between the carboxyl groups, forming inversion dimers.

2-[(2-Acetoxybenzoyl)oxy]benzoic acid