title: Identification of two novel promelacacinidin dimers from Acacia nigrescens.
abstract: Two new flavanol-flavonol C(4)(C) to C(5)(D) linked promelacacinidin dimers were isolated from the heartwood of Acacia nigrescens. Their structures were elucidated by extensive (1)H and (13)C NMR spectroscopic studies, and the main conformational features are discussed.
authors.affiliation: Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300 South Africa.
authors.forename: Hiten
authors.initials: H
authors.lastname: Howell
authors.forename: Elfranco
authors.initials: E
authors.lastname: Malan
authors.forename: Jacobus A
authors.initials: JA
authors.lastname: Steenkamp
authors.forename: E Vincent
authors.initials: EV
authors.lastname: Brandt
authors.forename: Jaco
authors.initials: J
authors.lastname: Brand
mesh_terms: D000045:Acacia / Q000737:chemistry*; D002855:Chromatography, Thin Layer; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D008745:Methylation; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D013019:South Africa; D013237:Stereoisomerism; D014934:Wood
chemical_list: D005419:Flavonoids; C461740:epimesquitol-(4beta-5)-3,3',4',7,8-pentahydroxyflavonone; C461739:mesquitol-(4alpha-5)-3,3',4',7,8-pentahydroxyflavonone