The asymmetric unit of the title compound, C34H16O5, contains two independent molecules (A and B) with similar conformations. The two benzene rings attached to the ninemembered ring are inclined to one another at 63.62 (14)degrees in molecule A and 68.23 (12)degrees in molecule B. One intramoleculer C-H center dot center dot center dot O hydrogen bond occurs in molecule A and two are observed in molecule B. In the crystal, molecules are linked by weak C-H center dot center dot center dot O hydrogen bonds, forming a three-dimensional network structure with R 2 2(10) and R 2 2(24) ring motifs. Aromatic pi-pi stacking interactions [ centroid-centroid distances = 3.7572 (19), 3.6996 (19) and 3.7043 (19) A degrees] are also observed. The unit cell contains a pair of voids of 37 (2) angstrom(3) about an inversion centre but the residual electron density (highest peak = 0.19 e angstrom(-3) and deepest hole = -0.20 e angstrom(-3)) in the difference Fourier map suggests that no solvent molecule occupies this void.