title: Two new steroidal saponins from Tribulus terrestris.
abstract: Two new steroidal saponins and two known flavonoid glycosides were isolated from the fruits of Tribulus terrestris. Their structures were assigned by spectroscopic analysis and chemical reaction as 26-O-beta-D-glucopyranosyl-(25R)-5 alpha-furostan-12-one-3beta,22 alpha,26-triol-3-O-beta-D-glucopyranosyl (1 --> 2)-beta-D-glucopyranosyl(1 --> 4)-beta-D-galactopyranoside (1), 26-O-beta-D-glucopyranosyl-(25S)-5 alpha-furostan-22-methoxy-2 alpha,3beta,26-triol-3-O-beta-D-glucopyranosyl(1 --> 2)-beta-D-glucopyranosyl(1 --> 4)-beta-D-galactopyranoside (2), kaempferol-3-gentiobioside (3), and isorhamnetin-3-gentiobioside (4).
authors.affiliation: School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China.
authors.forename: Lan
authors.initials: L
authors.lastname: Su
authors.forename: Sheng-Guang
authors.initials: SG
authors.lastname: Feng
authors.forename: Li
authors.initials: L
authors.lastname: Qiao
authors.forename: Yu-Zhi
authors.initials: YZ
authors.lastname: Zhou
authors.forename: Rui-Ping
authors.initials: RP
authors.lastname: Yang
authors.forename: Yue-Hu
authors.initials: YH
authors.lastname: Pei
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D005638:Fruit / Q000737:chemistry; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010840:Phytosterols / Q000737:chemistry / Q000302:isolation & purification*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D013237:Stereoisomerism; D032444:Tribulus / Q000737:chemistry*
chemical_list: C539300:26-O-beta-D-glucopyranosyl-(25R)-5 alpha-furostan-12-one-3beta,22 alpha,26-triol-3-O-beta-D-glucopyranosyl (1-2)-beta-D-glucopyranosyl(1-4)-beta-D-galactopyranoside; C539301:26-O-beta-D-glucopyranosyl-(25S)-5 alpha-furostan-22-methoxy-2 alpha,3beta,26-triol-3-O-beta-D-glucopyranosyl(1-2)-beta-D-glucopyranosyl(1-4)-beta-D-galactopyranoside; D004365:Drugs, Chinese Herbal; D005419:Flavonoids; D010840:Phytosterols; D012503:Saponins