title: Two new flavonoids from Origanum vulgare.
abstract: In addition to the major constituents apigenin, luteolin, salvagenin, cirsimartin, diosmetin, desmethoxycentauridin, 5-hydroxy-6,7,3',4'-tetramethoxy-abigenin, apigenin 7-O-glucoside, luteolin 7-O-glucoside, luteolin 7-O-glucoside-6''-methylester, two new flavonoids were isolated, in minor concentration, and identified as luteolin 7-O-alpha-L-rhamnoside-4'-O-beta-D-glucoside and quercetin 3-O-beta-D-glucoside-4'-O-alpha-L-rhamnoside from the methanolic extract of Origanum vulgare L. The structures were determined by conventional analytical methods and confirmed by MS and NMR spectral analysis.
authors.affiliation: Phytochemistry and Plant Systematics Department, National Research Centre, Cairo, Egypt.
authors.forename: Usama W
authors.initials: UW
authors.lastname: Hawas
authors.forename: S K
authors.initials: SK
authors.lastname: El-Desoky
authors.forename: S A
authors.initials: SA
authors.lastname: Kawashty
authors.forename: M
authors.initials: M
authors.lastname: Sharaf
mesh_terms: D003889:Desert Climate; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D019686:Lamiaceae / Q000737:chemistry*; D047311:Luteolin / Q000032:analysis; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D005419:Flavonoids; C533824:luteolin 7-O-alpha-L-rhamnoside-4'-O-beta-D-glucoside; C533825:quercetin 3-O-beta-D-glucoside-4'-O-alpha-L-rhamnoside; D047311:Luteolin