title: Two new spirostanol saponins from Allium tuberosum.
abstract: Two new spirostanol saponins, tuberosides D and E, have been isolated from the seeds of Allium tuberosum. On the basis of spectral data and chemical reactions, their structures were established as (25S)-5alpha-spirostane-2alpha,3beta-diol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-O-[alpha-L-rhamnopyranosyl-(1-->4 )]-O-beta-D-glucopyranoside and (25S)-5alpha-spirostan-2alpha, 3beta-diol 3-O-beta-D-glucopyranosyl-(1-->2)-O-[alpha-L-rhamnopyranosyl-(1-->4)] -O-beta-D-glucopyranoside, respectively.
authors.affiliation: Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200031, People's Republic of China.
authors.forename: S
authors.initials: S
authors.lastname: Sang
authors.forename: A
authors.initials: A
authors.lastname: Lao
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Chen
mesh_terms: D000490:Allium / Q000737:chemistry*; D002240:Carbohydrate Sequence; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D012639:Seeds / Q000737:chemistry; D013150:Spirostans / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D006027:Glycosides; D013150:Spirostans; C121577:tuberoside D; C121578:tuberoside E