title: Phyllanemblinins A-F, new ellagitannins from Phyllanthus emblica.
abstract: Six new ellagitannins, phyllanemblinins A-F (1-6), were isolated from Phyllanthus emblica, along with 30 known tannins and related compounds. Their structures were determined by spectral and chemical methods. Phyllanemblinins A (1) and B (2) were confirmed to be ellagitannins having a tetrahydroxybenzofuran dicarboxyl group and a hexahydroxydiphenoyl group, respectively, by chemical synthesis from furosin (8). Phyllanemblinin C (3) has a new acyl group at the glucose 2,4-positions and is structurally related to chebulagic acid. Phyllanemblinins D (4), E (5), and F (6) were found to be positional isomers of neochebuloyl 1(beta)-O-galloylglucose.
authors.affiliation: Faculty of Pharmaceutical Sciences, Nagasaki University, Bunkyo-Machi 1-14, Nagasaki 852-8521, Japan.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Zhang
authors.forename: T
authors.initials: T
authors.lastname: Abe
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: C R
authors.initials: CR
authors.lastname: Yang
authors.forename: I
authors.initials: I
authors.lastname: Kouno
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002855:Chromatography, Thin Layer; D002942:Circular Dichroism; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D004365:Drugs, Chinese Herbal; D019665:Euphorbiaceae / Q000737:chemistry*; D005638:Fruit / Q000737:chemistry; D018922:HL-60 Cells / Q000187:drug effects; D006367:HeLa Cells / Q000187:drug effects; D006801:Humans; D047348:Hydrolyzable Tannins; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D024301:Plant Bark / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism; D013634:Tannins / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004365:Drugs, Chinese Herbal; D047348:Hydrolyzable Tannins; D013634:Tannins; C013515:ellagitannin