title: Anhydroicaritin 3-O-rhamnosyl(1-->2)rhamnoside from epimedium koreanum and a reappraisal of other rhamnosyl(1-->2, 1-->3 and 1-->4)rhamnoside structures.
abstract: An anhydroicaritin 3-O-rhamnosylrhamnoside from Epimedium koreanum is defined as the 3-O-alpha-L-[alpha-L-rhamnopyranosyl(1-->2)rhamnopyranoside] on the basis of 2D NMR evidence. Complete assignments of the 1H and 13C NMR spectra of this compound are presented for the first time. The NMR distinction of 1-->2, 1-->3 and 1-->4 linked rhamnopyranosylrhamnopyranosides are discussed and indicate that baohuosides III and V from E. davidii and baohuoside VI from E. davidii and E. pubescens, respectively, are (1-->2) linked.
authors.affiliation: Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
authors.forename: W K
authors.initials: WK
authors.lastname: Li
authors.forename: J Q
authors.initials: JQ
authors.lastname: Pan
authors.forename: M J
authors.initials: MJ
authors.lastname: Lü
authors.forename: P G
authors.initials: PG
authors.lastname: Xiao
authors.forename: R Y
authors.initials: RY
authors.lastname: Zhang
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004187:Disaccharides / Q000737:chemistry* / Q000302:isolation & purification; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010944:Plants / Q000737:chemistry*; D012210:Rhamnose; D013329:Structure-Activity Relationship
chemical_list: D004187:Disaccharides; D005419:Flavonoids; D006027:Glycosides; C101844:anhydroicaritin 3-O-rhamnosyl-1-2-rhamnoside; D012210:Rhamnose