title: A new flavonoid glucoside from Rhododendron seniavinii.
abstract: The leaves of Rhododendron seniavinii Maxim with little phytochemical information are used as folk remedies for the treatment of acute and chronic bronchitis in China. In our pursuing for the biologically active chemical constituents in the leaves, a new flavonoid glycoside 5,7,3'-trimethoxy-quercetin-3-O-β-D-glucopyranoside (1) was isolated from the water extract of its leaves, together with two known compounds 5,7,3'-trimethoxy-quercetin (2) and ovafolinin B-9'-O-β-D-glucopyranoside (3). The structures of the new flavonoid glucoside as well as two known compounds were elucidated by spectroscopic and chemical methods.
authors.affiliation: a Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine and New Drugs Research, Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University , Guangzhou 510632 , China.
authors.forename: Qing-Qing
authors.initials: QQ
authors.lastname: Wang
authors.forename: Chun
authors.initials: C
authors.lastname: Wu
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.forename: Bai-Lian
authors.initials: BL
authors.lastname: Liu
authors.forename: Guang-Xiong
authors.initials: GX
authors.lastname: Zhou
mesh_terms: D002681:China; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry; D011794:Quercetin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification*; D029793:Rhododendron / Q000737:chemistry*
chemical_list: C000602414:5,7,3'-trimethoxy-quercetin-3-O-beta-D-glucopyranoside; D004365:Drugs, Chinese Herbal; D005419:Flavonoids; D005960:Glucosides; D011794:Quercetin
keywords: 5,7,3′-trimethoxy-quercetin-3-O-β-d-glucopyranoside; Rhododendron seniavinii; flavonoid glucoside