title: [Study on glycosidal constituents from Epigynum auritum].
abstract: A known compound and a new glycoside, epigeoside, were isolated from the rhizomes of Epigynum auritum (Schneid.) Tsiang et P. T. Li (Apocynaceae). The structure of known compound was identified as daucosterol (beta-sitosterol-beta-D-glucopyranoside). The structure of epigeoside has been deduced on the basis of spectral analysis and chemical reactions as catechin-3-O-alpha-L-rhamnopyranosyl-(1----4)-beta-D-glucopyranosyl-(1-- --6) -beta-D-glucopyranoside. Partial hydrolysis of II with 0.2 mol/L HCl afforded compound IIa and rhamnose. Acid hydrolysis of IIa with 2 mol/L HCl afforded an aglycone which was identified by comparison with catechin, and glucose.
authors.affiliation: Laboratory of Phytochemistry, Kunming Institute of Botany, Chinese Academy of Sciences.
authors.forename: Q D
authors.initials: QD
authors.lastname: Jin
authors.forename: Q Z
authors.initials: QZ
authors.lastname: Mu
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification*; D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D012855:Sitosterols / Q000302:isolation & purification
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004365:Drugs, Chinese Herbal; D006027:Glycosides; D012855:Sitosterols; C076440:epigeoside; D002392:Catechin; C011015:lyoniside