title: Hexamethyl 13,14-dioxapenta-cyclo-[8.2.1.1(4,7).0(2,9).0(3,8)]tetra-deca-5,11-diene-1,4,5,6,11,12-hexa-carboxyl-ate.
abstract: In the title compound, C(24)H(24)O(14), the stereochemistry at the cyclo-butane ring is cis-anti-cis and the -COOMe groups in the bicyclic rings are syn to each other. The mol-ecule lies on a twofold rotation axis. In the crystal, weak C-H⋯O hydrogen bonds connect mol-ecules into chains along [001], forming R(2) (2)(10) rings.
authors.affiliation: Department of Chemistry, University of Toronto, Toronto, Ontario,  Canada  M5S 3H6.
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Lough
authors.forename: Kelsey
authors.initials: K
authors.lastname: Jack
authors.forename: William
authors.initials: W
authors.lastname: Tam