title: Three new saponins from Tribulus terrestris.
abstract: Three new steroidal saponins 1-3, together with five known steroidal saponins, L-mannitol and an inorganic salt were isolated from Tribulus terrestris L. (Zygophyllaceae). The structures of the new steroidal saponins were elucidated as hecogenin 3-O-beta-xylopyranosyl(1-->3)-beta-glucopyranosyl(1-->4)-beta-galactopyr anoside (1), hecogenin 3-O-beta-glucopyranosyl(1-->2)-beta-glucopyranosyl(1-->4)- beta-galactopyranoside (2) and 3-O-[beta-xylopyranosyl(1-->2)-[beta-xylopyranosyl(1-->3)]-beta- glucopyranosyl(1-->4)-[alpha-rhamnopyranosyl(1-->2)]-beta-galactopyranos yl]- 26-O-beta-glucopyranosyl-22-methoxy-(3 beta,5 alpha,25R)-furostan-3,26-diol (3). Structure elucidation was accomplished by 1D and 2D NMR spectra (13C-1H COSY, HMQC, HMBC, 1H-1H COSY, TOCSY, and NOESY), mass spectrometry (FABMS, ESIMS) and chemical methods.
authors.affiliation: Department of Phytochemistry, College of Pharmacy, Second Military Medical University, Shanghai, People's Republic of China.
authors.forename: Y X
authors.initials: YX
authors.lastname: Xu
authors.forename: H S
authors.initials: HS
authors.lastname: Chen
authors.forename: H Q
authors.initials: HQ
authors.lastname: Liang
authors.forename: Z B
authors.initials: ZB
authors.lastname: Gu
authors.forename: W Y
authors.initials: WY
authors.lastname: Liu
authors.forename: W N
authors.initials: WN
authors.lastname: Leung
authors.forename: T J
authors.initials: TJ
authors.lastname: Li
mesh_terms: D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012503:Saponins