title: Triterpenes from Protium hebetatum resin.
abstract: Three olean (beta-amyrenone, beta-amyrin and maniladiol), three ursane (alpha-amyrinone, alpha-amyrin and breine) and four tirucallane (3-oxotirucalla-8,24-dien-21-6ic acid, 3alpha-hydroxytirucalla-8,24-dien-21-oic acid, 3alpha-acetoxytirucalla-8,24-dien-21-oic acid and 3alpha-hydroxytirucalla-7,24-dien-21-oic acid) triterpenes were isolated from the oleoresin of Protium hebetatum Daly. The structures were established mainly by 13C, 1D and 2D NMR spectroscopic analysis. The isolation of 3alpha-hydroxytirucalla-8,24-dien-21-oic acid permitted correction of the chemical shift assignments of some of its carbon atoms.
authors.affiliation: Centro de Ciências da Natureza e Biológicas, Universidade Federal do Acre, 69915-900 Rio Branco-AC, Brazil.
authors.forename: Delcio Dias
authors.initials: DD
authors.lastname: Marques
authors.forename: Ilmar Bernardo
authors.initials: IB
authors.lastname: Graebner
authors.forename: Telma Leda Gomes
authors.initials: TL
authors.lastname: de Lemos
authors.forename: Luciana Lucas
authors.initials: LL
authors.lastname: Machado
authors.forename: Jõao Carlos Costa
authors.initials: JC
authors.lastname: Assunção
authors.forename: Francisco José Queiroz
authors.initials: FJ
authors.lastname: Monte
mesh_terms: D029403:Burseraceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes
chemical_list: D010936:Plant Extracts; D014315:Triterpenes; C018620:oleoresins