title: Tetra-tert-butyl 13,14-dioxapenta-cyclo-[8.2.1.1(4,7).0(2,9).0(3,8)]tetra-deca-5,11-diene-5,6,11,12-tetra-carboxyl-ate.
abstract: The stereochemistry of the title compound, C(32)H(44)O(10), at the cyclo-butane ring is cis-anti-cis. The mol-ecule lies across an inversion center. In the crystal, weak C-H⋯O hydrogen bonds connect mol-ecules into chains along [100], forming R(2) (2)(6) 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