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In the title compound, C 18 H 12 O 5 , the anthracene moiety is almost planar (r.m.s. deviation = 0.0399 Å). In the crystal, mol­ecules are linked to each other by inter­molecular O—H⋯O and weak C—H⋯O hydrogen bonds.

4-(9,10-Dioxo-9,10-dihydroanthracen-1-yl)-4-oxobutanoic acid