title: [New oxindole alkaloid glycosides from Uncaria sinensis].
abstract: Two 16-carboxy derivatives of pentacyclic oxindole alkaloids and its glucopyranosyl esters have been isolated from the ethanolic extract of the leaves of Uncaria sinensis (Olive.) Havil. These structures were deduced on the basis of spectroscopic evidences and chemical correlations, and named mitraphyllic acid (I), isomitraphyllic acid (II), isomitraphyllic acid (16-1)-beta-D-glucopyranosyl ester (III) and mitraphyllic acid (16-1)-beta-D-glucopyranosyl ester (IV).
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing.
authors.forename: H M
authors.initials: HM
authors.lastname: Liu
authors.forename: Z
authors.initials: Z
authors.lastname: Jiang
authors.forename: X Z
authors.initials: XZ
authors.lastname: Feng
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D013141:Spiro Compounds / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D007211:Indoles; D013141:Spiro Compounds; C087790:mitraphyllic acid