title: Swietenolide monohydrate.
abstract: The title compound, a natural b,d-seco-limonoid, C(27)H(34)O(8)·H(2)O, and known as Swietenolide monohydrate, has been isolated from S. macrophylla King. In the molecular structure, the four fused six-membered rings adopt twist-boat (ring A), approximate chair (ring B), envelope (ring C) and half-chair (ring D) conformations. The attached furan ring is essentially planar. O-H⋯O hydrogen bonds and weak C-H⋯O inter-actions connect the mol-ecules into a two-dimensional network parallel to the (100) plane. C-H⋯π inter-actions are also observed.
authors.forename: Seok-Keik
authors.initials: SK
authors.lastname: Tan
authors.forename: Hasnah
authors.initials: H
authors.lastname: Osman
authors.forename: Keng-Chong
authors.initials: KC
authors.lastname: Wong
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Suchada
authors.initials: S
authors.lastname: Chantrapromma