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In the title compound, C 22 H 24 O 14 , the relative stereochemistry at the cyclo­butane ring is  cis-anti-cis  and the methyl groups in the bicyclic rings are  syn  to each other. The two carboxyl­ate groups attached to the same —C=C— bond are disordered over two sets of sites in a 0.603 (2):0.397 (2) ratio. In the crystal, weak C—H⋯O hydrogen bonds connect mol­ecules into  C (12) chains along [001] incorporating  R   2   2   2 (10) rings.

Tetramethyl 1,4-dimethyl-13,14-dioxapentacyclo[8.2.1.14,7.02,9.03,8]tetradeca-5,11-diene-5,6,11,12-tetracarboxylate

Tetramethyl 1,4-dimethyl-13,14-dioxapentacyclo[8.2.1.1^4,7.0^2,9.0^3,8]tetradeca-5,11-diene-5,6,11,12-tetracarboxylate