Experimental

R factor = 0.043; wR factor = 0.124; data-to-parameter ratio = 13.7. In the title compound, C35H28O6C7H8, the dihedral angle between the mean planes through the naphthalene ring systems of the dibenzo[a,g]fluorene moiety is 22.44 (3). The aromatic ring system of the naphthalenone unit is approxi-mately perpendicular to the mean plane of the five-membered ring, forming a dihedral angle of 87.51 (5). An intramolecular C—H O hydrogen bond is observed. In the crystal, pairs of C—H interactions link the molecules, forming inversion dimers. Related literature For electrophilic aromatic aroylation of the 2,7-dimethoxy-naphthalene core, see: Okamoto & Yonezawa (2009); Okamoto et al. (2011)