title: Flavonolignans from Hyparrhenia hirta.
abstract: Leaves of Hyparrhenia hirta yielded the rare diastereoisomeric flavonolignans tricin 4'-O-(erythro-beta-guaiacylglyceryl) ether and tricin 4'-O-(threo-beta-guaiacylglyceryl) ether together with their 7-O-glucosides, which are the first flavonolignan glycosides to be isolated as natural products. A complete set of (1)H and (13)C NMR resonance assignments obtained for both flavonolignan aglycones indicates the need for revision of data published previously for these compounds and for a reassessment of their original stereochemical designation.
authors.affiliation: Laboratoire de Chimie des Substances Naturelles, Faculté des Sciences de Sfax, BP 802, 3018 Sfax, Tunisia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bouaziz
authors.forename: Nigel C
authors.initials: NC
authors.lastname: Veitch
authors.forename: Renée J
authors.initials: RJ
authors.lastname: Grayer
authors.forename: Monique S J
authors.initials: MS
authors.lastname: Simmonds
authors.forename: Mohamed
authors.initials: M
authors.lastname: Damak
mesh_terms: D005419:Flavonoids / Q000032:analysis* / Q000737:chemistry; D006027:Glycosides / Q000032:analysis* / Q000737:chemistry; D017705:Lignans / Q000032:analysis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D006109:Poaceae / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D005419:Flavonoids; D006027:Glycosides; D017705:Lignans