title: An unusual piceatannol dimer from Rheum austral D. Don with antioxidant activity.
abstract: A novel dimer of piceatannol glycoside, named rheumaustralin (1) was isolated from the underground parts of the ethnomedicinal plant Rheum austral (Polygonaceae) collected from Tibet together with 17 known compounds, including rheumin (2), 2,5-dimethyl-7-hydroxychromone (3), 2,5-dimethylchromone-7-O-β-D-glucopyranoside (4), 7-hydroxy-2-(2'-hydroxypropyl)-5-methylchromone (5), torachrysone (6) torachrysone-8-O-β-D-glucopyranoside (7), 4-(4'-hydroxyphenyl)-2-butanone-4'-O-β-D-glucopyranoside (8), amabiloside (9), N-trans-feruloyl tyramine (10), chrysophanol (11), aloe-emodin (12), emodin (13), physcion (14), physcion-1-O-β-D-glucopyranoside (15), emodin-8-O-β-D-glucopyranoside (16), D-catechin (17) and gallic acid (18). Their structures were determined by combined spectroscopic methods and by comparison of their spectral data with those reported in literature. Compounds 1-10 were tested for their ability to scavenge 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical.
authors.affiliation: Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650031, China. hulin66@163.com.
authors.forename: Lin
authors.initials: L
authors.lastname: Hu
authors.affiliation: Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650031, China. cnana1111@126.com.
authors.forename: Na-Na
authors.initials: NN
authors.lastname: Chen
authors.affiliation: Kunming Xianghao Technology Co., Ltd., Kunming 650204, China. huqun871@163.com.
authors.forename: Qun
authors.initials: Q
authors.lastname: Hu
authors.affiliation: Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650031, China. yangynni@163.com.
authors.forename: Cui
authors.initials: C
authors.lastname: Yang
authors.affiliation: Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650031, China. smkms@126.com.
authors.forename: Qing-Song
authors.initials: QS
authors.lastname: Yang
authors.affiliation: Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650031, China. foreverfang98@126.com.
authors.forename: Fang-Fang
authors.initials: FF
authors.lastname: Wang
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000494:pharmacology*; D019281:Dimerization; D016166:Free Radical Scavengers / Q000737:chemistry / Q000494:pharmacology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D012250:Rheum / Q000737:chemistry*; D013267:Stilbenes / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D010936:Plant Extracts; D013267:Stilbenes; C041525:3,3',4,5'-tetrahydroxystilbene
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