title: Quassinoids from Eurycoma longifolia.
abstract: Three quassinoids, eurycolactone D (1), eurycolactone E (2) and eurycolactone F (3) were isolated from the roots of Eurycoma longifolia Jack. The structures of 1-3 were elucidated by spectroscopic methods, and that of 3 was further confirmed by X-ray crystallography. The known quassinoids, laurycolactone B (4) and eurycomalactone (5) were also identified.
authors.affiliation: School of Pharmacy, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, 192-0392, Tokyo, Japan.
authors.forename: Hooi Hoon
authors.initials: HH
authors.lastname: Ang
authors.forename: Yukio
authors.initials: Y
authors.lastname: Hitotsuyanagi
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Fukaya
authors.forename: Koichi
authors.initials: K
authors.lastname: Takeya
mesh_terms: D018360:Crystallography, X-Ray; D007783:Lactones / Q000737:chemistry* / Q000302:isolation & purification; D008968:Molecular Conformation; D018517:Plant Roots / Q000737:chemistry; D029641:Simaroubaceae / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D007783:Lactones; C465320:eurycolactone D; C465322:eurycolactone E; C465321:eurycolactone F