title: Pentacyclic triterpenes from Chuquiraga ulicina.
abstract: Four taraxastane triterpenes, 3 beta-acetoxy-6 beta-hydroxytaraxasta-20-ene, 6 beta-hydroxytaraxasta-20-en-3-one, 6 beta-hydroxytaraxasta-20-ene 3 beta-palmitate and 3 beta,6 beta-dihydroxytaraxasta-20-ene were isolated from the dichloromethane-methanol extract of Chuquiraga ulicina ssp. ulicina together with the known triterpenes lupeol, lupenyl acetate, lupenone, friedelinol, 3 beta-acetoxy-30-nor-lupan-20-one, and 30-nor-lupan-3 beta-ol-20-one.
authors.affiliation: Department of Pharmaceutical Sciences, College of Pharmacy, University of Arizona, Tucson 85721, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Flagg
authors.forename: S
authors.initials: S
authors.lastname: Valcic
authors.forename: G
authors.initials: G
authors.lastname: Montenegro
authors.forename: M
authors.initials: M
authors.lastname: Gomez
authors.forename: B N
authors.initials: BN
authors.lastname: Timmermann
mesh_terms: D002677:Chile; D003889:Desert Climate; D008958:Models, Molecular; D008968:Molecular Conformation; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D010946:Plants, Medicinal; D018629:Spectrometry, Mass, Secondary Ion; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D010936:Plant Extracts; D014315:Triterpenes