title: Two biflavonoids from Ouratea nigroviolacea.
abstract: The leaves of Ouratea nigroviolacea (Ochnaceae) afforded two biflavonoids, ouratine A and B together with agathisflavone and stigmasterol. The biflavonoids were characterized as 4'-O-methylated apigeninyl-(I-6, II-8)-4'-O-methylatedapigenin and 4'-O-methylated apigeninyl-(I-6, II-8) apigenin by spectral and chemical transformation studies.
authors.affiliation: Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon.
authors.forename: Josephine
authors.initials: J
authors.lastname: Ngo Mbing
authors.forename: Cécile
authors.initials: C
authors.lastname: Enguehard-Gueiffier
authors.forename: Alex de Théodore
authors.initials: Ade T
authors.lastname: Atchadé
authors.forename: Hassan
authors.initials: H
authors.lastname: Allouchi
authors.forename: Joseph
authors.initials: J
authors.lastname: Gangoué-Piéboji
authors.forename: Joseph Tanyi
authors.initials: JT
authors.lastname: Mbafor
authors.forename: Raphael Ghogomu
authors.initials: RG
authors.lastname: Tih
authors.forename: Jacques
authors.initials: J
authors.lastname: Pothier
authors.forename: Dieudonné Emmanuel
authors.initials: DE
authors.lastname: Pegnyemb
authors.forename: Alain
authors.initials: A
authors.lastname: Gueiffier
mesh_terms: D044946:Biflavonoids / Q000737:chemistry* / Q000302:isolation & purification; D015394:Molecular Structure; D043842:Ochnaceae / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D014961:X-Ray Diffraction
chemical_list: D044946:Biflavonoids; D010936:Plant Extracts; C519047:ouratine A; C519048:ouratine B