title: Four new flavones and a new isoflavone from Iris bungei.
abstract: Four new irisflavones A-D (1-4) and irilin D (5) have been isolated from the underground parts of Iris bungei along with known isoflavones, irilins A-B (6-7) and tlatancuayin (8). The structures of the new compounds were determined using NMR and mass spectroscopic methods and were found to be 2',5,7-trihydroxy-3,6-dimethoxyflavone (1), 2',5-dihydroxy-3,6,7-trimethoxyflavone (2), 2',5,6'-trihydroxy-3,6,7-trimethoxyflavone (3), 3,3',5-trihydroxy-2',7-dimethoxyflavone (4), and 3',4',5,7-tetrahydroxy-6-methoxyisoflavone (5). The structures of irisflavones 1, 3, and 4 were confirmed by single-crystal X-ray diffraction studies.
authors.affiliation: H. E. J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi-75270, Pakistan. hejric@digicom.net.pk
authors.forename: M I
authors.initials: MI
authors.lastname: Choudhary
authors.forename: M
authors.initials: M
authors.lastname: Nur-e-Alam
authors.forename: I
authors.initials: I
authors.lastname: Baig
authors.forename: F
authors.initials: F
authors.lastname: Akhtar
authors.forename: A M
authors.initials: AM
authors.lastname: Khan
authors.lastname: Ndögnii PO
authors.forename: T
authors.initials: T
authors.lastname: Badarchiin
authors.forename: G
authors.initials: G
authors.lastname: Purevsuren
authors.forename: N
authors.initials: N
authors.lastname: Nahar
authors.lastname: Atta-ur-Rahman
mesh_terms: D002855:Chromatography, Thin Layer; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D007529:Isoflavones / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D015394:Molecular Structure; D008986:Mongolia; D018517:Plant Roots / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D013329:Structure-Activity Relationship; D014961:X-Ray Diffraction
chemical_list: D005419:Flavonoids; D007529:Isoflavones; C435246:irilin A; C435245:irilin B; C435244:irilin D; C435243:tlatancuayin