title: Two new nor-triterpene glycosides from peruvian "Uña de Gato" (Uncaria tomentosa).
abstract: Two new 27-nor-triterpene glycosides, tomentosides A (1) and B (2), were isolated from Peruvian "Uña de Gato" (cat's claw, plant of origin: Uncaria tomentosa), a traditional herbal medicine in Peru. Their structures were determined by spectroscopic analysis and chemical interconversions. This is the first report of naturally occurring pyroquinovic acid glycosides.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
authors.forename: Mariko
authors.initials: M
authors.lastname: Kitajima
authors.forename: Ken-Ichiro
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Masashi
authors.initials: M
authors.lastname: Yokoya
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Takayama
authors.forename: Manuel
authors.initials: M
authors.lastname: Sandoval
authors.forename: Norio
authors.initials: N
authors.lastname: Aimi
mesh_terms: D020948:Cat's Claw / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D006868:Hydrolysis; D008519:Medicine, Traditional; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010568:Peru; D010946:Plants, Medicinal / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D006027:Glycosides; D014315:Triterpenes; C475236:tomentoside A; C475237:tomentoside B