Dibenzo[b,g]indeno­[1′,2′:3,4]fluoreno[1,2-d]oxonine-5,11,16,21-tetra­one

The asymmetric unit of the title compound, C(34)H(16)O(5), contains two independent mol­ecules (A and B) with similar conformations. The two benzene rings attached to the nine-membered ring are inclined to one another at 63.62 (14)° in mol­ecule A and 68.23 (12)° in mol­ecule B. One intra­moleculer C—H⋯O hydrogen bond occurs in mol­ecule A and two are observed in mol­ecule B. In the crystal, mol­ecules are linked by weak C—H⋯O hydrogen bonds, forming a three-dimensional network structure with R (2) (2)(10) and R (2) (2)(24) ring motifs. Aromatic π–π stacking interactions [centroid–centroid distances = 3.7572 (19), 3.6996 (19) and 3.7043 (19) Å] are also observed. The unit cell contains a pair of voids of 37 (2) Å(3) about an inversion centre but the residual electron density (highest peak = 0.19 e Å(−3) and deepest hole = −0.20 e Å(−3)) in the difference Fourier map suggests that no solvent mol­ecule occupies this void.