title: Diterpenoid glycosides from the bitter fern Gleichenia quadripartita.
abstract: Fifteen new diterpenoid glycosides (1a-n, 2) were isolated from an Argentine collection of the bitter fern Gleichenia quadripartita along with the known flavonoid glycoside afzelin. Structure elucidation was accomplished by 1D and 2D NMR spectroscopy and by high-resolution MS analyses. In addition, X-ray crystallographic analysis of a monocrystal of 1a as well as chemical derivatization of 1h and 1m were performed to confirm their structures.
authors.affiliation: Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, Tucumán, Argentina.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Socolsky
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Asakawa
authors.forename: Alicia
authors.initials: A
authors.lastname: Bardón
mesh_terms: D001118:Argentina; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification*; D029624:Ferns / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification*; D008362:Mannosides / Q000737:chemistry / Q000302:isolation & purification; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D044945:Proanthocyanidins / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D004224:Diterpenes; D006027:Glycosides; D008362:Mannosides; D044945:Proanthocyanidins; C477954:afzelin