title: Pregnane- and furostane-type oligoglycosides from the seeds of Allium tuberosum.
abstract: Two furostane-type steroidal oligoglycosides (1, 2), together with a new pregnane-type oligoglycoside (3), were obtained from the seeds of Allium tuberosum ROTTLER. On the basis of spectroscopic analysis, the structures of three new oligoglycosides (1-3) were elucidated as 26-O-beta-D-glucopyranosyl-(25R)-3beta,22xi,26-trihydroxyl-5alpha-furostane 3-O-beta-chacotrioside, 26-O-beta-D-glucopyranosyl-(25S)-3beta,5beta,6alpha,22xi,26-pentahydroxyl-5beta-furostane 3-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranoside, and 3-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl 3beta,5beta,6alpha,16beta-tetrahydroxypregnane 16-(5-O-beta-D-glucopyranoyl-4(S)-methyl-5-hydroxypentanoic acid) ester, respectively.
authors.affiliation: Faculty of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862-0973, Japan. tikeda@gpo.kumamoto-u.ac.jp
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Ikeda
authors.forename: Hidetsugu
authors.initials: H
authors.lastname: Tsumagari
authors.forename: Masafumi
authors.initials: M
authors.lastname: Okawa
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Nohara
mesh_terms: D000490:Allium / Q000737:chemistry*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002849:Chromatography, Gas; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D006027:Glycosides / Q000737:chemistry*; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D000432:Methanol; D009844:Oligosaccharides / Q000737:chemistry*; D010936:Plant Extracts; D011278:Pregnanes / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry; D012997:Solvents; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D006027:Glycosides; D009844:Oligosaccharides; D010936:Plant Extracts; D011278:Pregnanes; D012997:Solvents; D000432:Methanol