title: 7,11,18,21-Tetra-oxatrispiro-[5.2.2.5.2.2]heneicosa-ne.
abstract: The four six-membered rings all adopt chair conformations in the two independent mol-ecules of the title cyclo-hexa-none cyclic diacetal with penta-erythritol, C(17)H(28)O(4).
authors.forename: Jiang-Hua
authors.initials: JH
authors.lastname: Shi
authors.forename: Xian-You
authors.initials: XY
authors.lastname: Yuan
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng