title: Bruceine a.
abstract: The title compound, C(26)H(34)O(11), known as bruceine A, is a natural quassinoid extracted from the dried fruits of Brucea javanica. Its structure consists of five fused rings including an oxygen-containing heterocyclic ring and a lactone ring. Two intra-molecular O-H⋯O links help to establish the mol-ecular conformation. In the crystal, O-H⋯O hydrogen bonds connect the mol-ecules.
authors.affiliation: State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, People's Republic of China.
authors.forename: Xue-Huan
authors.initials: XH
authors.lastname: Feng
authors.forename: Yan-Ning
authors.initials: YN
authors.lastname: Zhang
authors.forename: Wei-Zhi
authors.initials: WZ
authors.lastname: He
authors.forename: Lan
authors.initials: L
authors.lastname: Zhang
authors.forename: Hong-Yun
authors.initials: HY
authors.lastname: Jiang