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The title compound, C30H26O4, is a dimer of 6,6′-dimethyldibenzo[d,f][1,3]dioxepine linked by formation of a C—C bond in the para position with respect to one O atom. The dimer is arranged around an inversion centre. As is usually observed in related compounds, the dibenzo group is twisted, the two benzene rings making a dihedral angle of 41.56 (9)°. The seven-membered ring exhibits a twisted conformation.