title: Nine regioisomeric and stereoisomeric triterpene dimers from Maytenus chuchuhuasca.
abstract: Nine regioisomeric and stereoisomeric triterpene dimers, namely xuxuarine Falpha (1), isoxuxuarine Falpha (2; cangorosin B), 7,8-dihydroisoxuxuarine Falpha (3), isoxuxuarine Gbeta (4), 7,8-dihydroisoxuxuarine Galpha (5), isoxuxuarine Ebeta (6), 7alpha-hydroxyisoxuxuarine Ealpha (7), 7',8'-dihydroxuxuarine Aalpha (8), and 7',8'-dihydroxuxuarine Dbeta (9), were isolated from the Brazilian medicinal plant "xuxuá" (Maytenus chuchuhuasca). Their structures have been elucidated based on several spectroscopic analyses including 2D-NMR experiments, MS spectra and CD spectral studies.
authors.affiliation: Division of Pharmacognosy, Phytochemistry and Narcotics, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan. shirota@nihs.go.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Shirota
authors.forename: Setsuko
authors.initials: S
authors.lastname: Sekita
authors.forename: Motoyoshi
authors.initials: M
authors.lastname: Satake
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Morita
authors.forename: Koichi
authors.initials: K
authors.lastname: Takeya
authors.forename: Hideji
authors.initials: H
authors.lastname: Itokawa
mesh_terms: D019281:Dimerization; D029755:Maytenus; D024301:Plant Bark; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D013237:Stereoisomerism; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D010936:Plant Extracts; D014315:Triterpenes