title: Minor methylated pyranoamentoflavones from Calophyllum venulosum.
abstract: Two new biflavonoids, pyranoamentoflavone 7-methyl ether (1) and pyranoamentoflavone 4'-methyl ether (2), have been isolated from the leaves of Calophyllum venulosum. The structures of these two new compounds were elucidated by spectroscopic data.
authors.affiliation: Department of Chemistry, The National University of Singapore, Singapore.
authors.forename: S G
authors.initials: SG
authors.lastname: Cao
authors.forename: K Y
authors.initials: KY
authors.lastname: Sim
authors.forename: S H
authors.initials: SH
authors.lastname: Goh
mesh_terms: D029759:Calophyllum / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D008296:Malaysia; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D005419:Flavonoids; C447260:pyranoamentoflavone 4'-methyl ether; C447259:pyranoamentoflavone 7-methyl ether