2,3-Di-hydro-1 H -cyclo-penta-[ b ]naphthalene-4,9-dione.

The title compound, C 13 H 10 O 2 , crystallizes with two almost planar mol-ecules in the asymmetric unit. In the crystal, slipped π-π stacking inter-actions help to establish the packing with the shortest centroid-centroid separation being 3.8195 (18) Å.