title: Three new polyphenols from the rhizomes of Arachniodes exilis.
abstract: Three new polyphenols, araspidin BB (1), arachniodesin A (2) and arachniodesin B (3), together with two known compounds, epicatechin (4) and procyanidin B-2 (5), were isolated from the rhizomes of Arachniodes exilis. The structures of three new compounds were elucidated as 5-methyl-methylene-bis-phlorobutyrophenone (1), 4beta-ethoxycarbonylmethylepicatechin (2) and epicatechin-(4beta --> 8)-4beta-ethoxycarbonylmethylepicatechin (3), on the basis of their spectral analysis and by comparing them with the related model compounds. Compounds 4 and 5 were obtained from the title plant for the first time.
authors.affiliation: Tong Ji Pharmaceutical College, Huazhong University of Science and Technology, Wuhan, China.
authors.forename: Dao-Nian
authors.initials: DN
authors.lastname: Zhou
authors.forename: Jin-Lan
authors.initials: JL
authors.lastname: Ruan
authors.forename: Ya-Lin
authors.initials: YL
authors.lastname: Cai
authors.forename: You-Qi
authors.initials: YQ
authors.lastname: Rao
authors.forename: Qiong
authors.initials: Q
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Fang
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry; D032491:Dryopteridaceae / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification*; D059808:Polyphenols; D027343:Rhizome / Q000737:chemistry
chemical_list: D004365:Drugs, Chinese Herbal; D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols