title: Cycloartane triterpenoids from Guarea macrophylla.
abstract: Nine cycloartane triterpenoids, including two new derivatives 22,25-dihydroxy-cycloart-23E-en-3-one and 24-methylenecycloartane-3 beta,22-diol have been isolated from leaves of Guarea macrophylla. The structures were elucidated by interpretation of spectral data, mainly 1H and 13C NMR, including bidimensional analysis (HOMOCOSY, HMQC and HMBC).
authors.affiliation: Instituto de Química, Universidade de São Paulo, C.P. 26077, CEP 05599-970, São Paulo, SP, Brazil. joaolago@iq.usp.br
authors.forename: João Henrique G
authors.initials: JH
authors.lastname: Lago
authors.forename: Nídia F
authors.initials: NF
authors.lastname: Roque
mesh_terms: D000998:Antiviral Agents / Q000302:isolation & purification; D001938:Brazil; D002845:Chromatography / Q000379:methods; D029582:Meliaceae / Q000737:chemistry*; D008968:Molecular Conformation; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D010455:Peptides; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D010940:Plant Proteins; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000998:Antiviral Agents; D010455:Peptides; D010936:Plant Extracts; D010940:Plant Proteins; D014315:Triterpenes; C058031:meliacin; C085352:cycloartane