title: The NMR studies on two new furostanol saponins from Agave sisalana leaves.
abstract: The detailed NMR studies and full assignments of the 1H and 13C spectral data for two new furostanol saponins isolated from Agave sisalana leaves are described. Their structures were established using a combination of 1D and 2D NMR techniques including 1H, 13C, 1H-1H COSY, TOCSY, HSQC, HMBC and HSQC-TOCSY, and also FAB-MS spectrometry and chemical methods. The structures were established as (25S)-26-(beta-D-glucopyranosyl)-22 xi-hydroxyfurost-12-one-3beta-yl-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->3)-O-[O-beta-D-glucopyranosyl-(1-->2)]-O-beta-D-glucopyranosyl-(1-->4)-beta-D-galacto- pyranoside (1) and (25S)-26-(beta-D-glucopyranosyl)-22xi-hydroxyfurost-5-en-12-one-3beta-yl-O-alpha-L-rhamno- pyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->3)-O-[O-beta-D-glucopyranosyl-(1-->2)]-O-beta-D-glucopyranosyl- (1-->4)-beta-D-galactopyranoside (2).
authors.affiliation: Beijing Institute of Radiation Medicine, Beijing 100850, People's Republic of China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zou
authors.forename: Jing
authors.initials: J
authors.lastname: Fu
authors.forename: He-shui
authors.initials: HS
authors.lastname: Yu
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Li-ping
authors.initials: LP
authors.lastname: Kang
authors.forename: Bai-ping
authors.initials: BP
authors.lastname: Ma
authors.forename: Xian-zhong
authors.initials: XZ
authors.lastname: Yan
mesh_terms: D027882:Agave / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D018515:Plant Leaves / Q000737:chemistry; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D013261:Sterols / Q000737:chemistry
chemical_list: C522462:26-glucopyranosyl-22xi-hydroxyfurost-12-one-3-yl-O-rhamnopyranosyl-1-4-glucopyranosyl-1-3-O-(O-glucopyranosyl-1-2)-O-glucopyranosyl-1-4-galactopyranoside; C522463:26-glucopyranosyl-22xi-hydroxyfurost-5-en-12-one-3-yl-O-rhamnopyranosyl-1-4-glucopyranosyl-1-3-O-(O-glucopyranosyl-1-2)-O-glucopyranosyl-1-4-galactopyranoside; D012503:Saponins; D013261:Sterols; C041827:furostanol I