title: A benzil and isoflavone from Iris tenuifolia.
abstract: Two compounds, tenuifodione (1) and tenuifone (2), and 12 known compounds, izalpinin (3), alpinone (4), arborinone (5), irilin B (6), irisone A (7), irisone B (8), betavulgarin (9), beta-sitosterol (10), 5,7-dihydroxy-2',6-dimethoxyisoflavone (11), 2',5-dihdroxy-6,7-methylenedioxy flavanone (12), irisoid A (13) and ethyl-beta-d-glucopyranoside (14) were isolated from the whole plant of Iris tenuifolia Pall. All compounds, except 12, were isolated for the first time from this plant. Compounds 2, 3 and 11 have shown a considerable DPPH radical scavenging activity. Structures of these compounds were identified on the basis of spectroscopic techniques, including 2D NMR. Compounds 3, 5 and 7 were also subjected to single-crystal X-ray diffraction analysis and their structures were unambiguously deduced.
authors.affiliation: H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan. hej@cyber.net.pk
authors.forename: Muhammad Iqbal
authors.initials: MI
authors.lastname: Choudhary
authors.forename: Sumaira
authors.initials: S
authors.lastname: Hareem
authors.forename: Hina
authors.initials: H
authors.lastname: Siddiqui
authors.forename: Shazia
authors.initials: S
authors.lastname: Anjum
authors.forename: Shamsher
authors.initials: S
authors.lastname: Ali
authors.lastname: Atta-Ur-Rahman
authors.forename: Mudassir Israr
authors.initials: MI
authors.lastname: Zaidi
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology; D018360:Crystallography, X-Ray; D020128:Inhibitory Concentration 50; D031323:Iris Plant / Q000737:chemistry*; D007529:Isoflavones / Q000737:chemistry* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D010658:Phenylglyoxal / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D013237:Stereoisomerism
chemical_list: D000975:Antioxidants; D007529:Isoflavones; D010658:Phenylglyoxal; C006697:benzil