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In the title compound, C14H10O2, the acenaphthenequinone core is essentially planar, with an r.m.s. deviation of 0.0140 Å. In the crystal, molecules are connected by π–π stacking interactions [centroid–centroid distances = 3.766 (3), 3.839 (3) and 3.857 (3) Å], forming columns parallel to the a axis.