title: Mixed lignan-neolignans from Tarenna attenuata.
abstract: Six new mixed lignan-neolignans and 20 known compounds were isolated from the whole plant of Tarenna attenuata. By analysis of physical and spectroscopic data, the structures of the new compounds were elucidated as (1R,5R,6R)-6-{4-O-[2-(1-(4-hydroxy-3-methoxyphenyl))glycerol]-3,5-dimethoxyphenyl}-3,7-dioxabicyclo[3.3.0]octan-2-one (1), 5' '-methoxyhedyotisol A (2), 4' '-O-(8-guaiacylglycerol)buddlenol A (3), 5' '-methoxy-4' '-O-(8-guaiacylglycerol)buddlenol A (4), 4,6-dimethoxy-5-hydroxy-3-hydroxymethyl-2-(3,4,5-trimethoxyphenyl)-2,3-dihydrobenzofuran (5), and 7-O-ethylguaiacylglycerol (6). Compounds 1, 5, 6, and 8 showed potent antioxidant activities against H2O2-induced impairment in PC12 cells, and compounds 1, 2, 5, and 7 scavenged DPPH radical strongly with IC50 values of 72, 87, 45, and 55 microM, respectively.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Xian-Wen
authors.initials: XW
authors.lastname: Yang
authors.forename: Pei-Ji
authors.initials: PJ
authors.lastname: Zhao
authors.forename: Yan-Lin
authors.initials: YL
authors.lastname: Ma
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Xiao
authors.forename: Yi-Qing
authors.initials: YQ
authors.lastname: Zuo
authors.forename: Hong-Ping
authors.initials: HP
authors.lastname: He
authors.forename: Ling
authors.initials: L
authors.lastname: Li
authors.forename: Xiao-Jiang
authors.initials: XJ
authors.lastname: Hao
mesh_terms: D000700:Analgesics / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D001713:Biphenyl Compounds; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000494:pharmacology; D006861:Hydrogen Peroxide / Q000494:pharmacology; D020128:Inhibitory Concentration 50; D017705:Lignans / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D016716:PC12 Cells; D010851:Picrates / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D051381:Rats; D019666:Rubiaceae / Q000737:chemistry*
chemical_list: D000700:Analgesics; D000975:Antioxidants; D001713:Biphenyl Compounds; D004365:Drugs, Chinese Herbal; D016166:Free Radical Scavengers; D017705:Lignans; D010851:Picrates; D006861:Hydrogen Peroxide; C004931:1,1-diphenyl-2-picrylhydrazyl