title: Pentaoxygenated xanthones and fatty acids from Bredemeyera brevifolia.
abstract: The polar portion of an ethanol extract of Bredemeyera brevifolia yielded two pentaoxygenated xanthones whose structures were determined as 1-methoxy-2,3,7,8-dimethylenedioxyxanthone, and 1,7,8-trimethoxy-2,3-methylene-dioxyxanthone. The apolar fraction contained various known fatty acids, structure determinations were accomplished by spectral analysis, mainly NMR, chemical derivatization and comparison to literature values.
authors.affiliation: Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, Brazil.
authors.forename: M C
authors.initials: MC
authors.lastname: de Oliveira
authors.forename: E R
authors.initials: ER
authors.lastname: Silveira
mesh_terms: D000818:Animals; D002460:Cell Line; D005227:Fatty Acids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006801:Humans; D019684:Magnoliopsida / Q000737:chemistry*; D015394:Molecular Structure; D013057:Spectrum Analysis; D014966:Xanthenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D044004:Xanthones
chemical_list: D005227:Fatty Acids; D014966:Xanthenes; D044004:Xanthones; C009689:xanthone