title: New resveratrol oligomer derivatives from the roots of Rheum lhasaense.
abstract: Two new resveratrol trimer derivatives, named rheumlhasol A (1) and rheumlhasol B (2) were isolated from the methanolic extract of roots of Rheum lhasaense A. J. Li et P. K. Hsiao together with four known resveratrol dimer derivatives, including maximol A (3), gnetin C (4), ε-viniferin (5), and pallidol (6). The structures were determined by combined spectroscopic methods and by comparison of their spectral data with those reported in the literature. All the compounds isolated from R. lhasaense were tested for their ability to scavenge1,1-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, Yunnan, China.
authors.forename: Wen-Bo
authors.initials: WB
authors.lastname: Liu
authors.forename: Lin
authors.initials: L
authors.lastname: Hu
authors.forename: Qun
authors.initials: Q
authors.lastname: Hu
authors.forename: Na-Na
authors.initials: NN
authors.lastname: Chen
authors.forename: Qing-Song
authors.initials: QS
authors.lastname: Yang
authors.forename: Fang-Fang
authors.initials: FF
authors.lastname: Wang
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry*; D000077185:Resveratrol; D012250:Rheum / Q000737:chemistry*; D013237:Stereoisomerism; D013267:Stilbenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D013267:Stilbenes; D000077185:Resveratrol