title: Acylated manoyl oxide diterpenes of Stemodia trifoliata.
abstract: Two new labdane diterpenes, 6alpha-malonyloxy-ethyl ester manoyl oxide and bis-6alpha-dioxymanoylmalonate, together with the known 6alpha-hydroxymanoyl oxide, 6alpha-malonyloxymaloyl oxide and betulinic acid were isolated from leaves of Stemodia trifoliata. Their structures were elucidated by spectroscopic studies (IR and HR-ESI-MS), including an extensive NMR (COSY, HSQC, HMBC and NOESY) analysis.
authors.affiliation: Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, CP 12200, 60021-970 Fortaleza, Ceará, Brazil.
authors.forename: Wildson Max B
authors.initials: WM
authors.lastname: da Silva
authors.forename: Edilberto R
authors.initials: ER
authors.lastname: Silveira
authors.forename: Otilia Deusdênia L
authors.initials: OD
authors.lastname: Pessoa
mesh_terms: D000215:Acylation; D004224:Diterpenes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D010936:Plant Extracts / Q000737:chemistry*; D028083:Scrophulariaceae / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D010936:Plant Extracts; C475535:manoyl oxide