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The title compound, C 28 H 24 O 5 , consists of a fused tricyclic system containing two five-membered rings and one six-membered ring. The five-membered rings both exhibit an envelope conformation with the O atom at the flap, whereas the six-membered ring adopts a boat conformation. The dihedral angle between the 4-methyl­phenyl rings at the 1,8-positions is 76.4 (1)°. In the crystal, mol­ecules are stacked in columns along the  a  axis through C—H⋯O inter­actions.

Dimethyl 1,8-bis(4-methylphenyl)-11-oxatricyclo[6.2.1.02,7]undeca-2,4,6,9-tetraene-9,10-dicarboxylate

Dimethyl 1,8-bis(4-methylphenyl)-11-oxatricyclo[6.2.1.0^2,7]undeca-2,4,6,9-tetraene-9,10-dicarboxylate