title: New acyclic diterpenic acids from yacon (Smallanthus sonchifolius) leaves.
abstract: Two new acyclic diterpenoids, smaditerpenic acid E (1a) and F (2a), along with nineteen melampolide-type sesquiterpene lactones, six of them not previously reported in yacon, were isolated from the methylene chloride leaf rinse extract. Their structures were elucidated from 1D and 2D NMR experiments and gas chromatography coupled to mass spectrometry.
authors.affiliation: INQUINOA-CONICET, Instituto de Química Orgánica, Facultad de Bioquímica Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, (T4000INI) San Miguel de Tucumán, Argentina.
authors.forename: María I
authors.initials: MI
authors.lastname: Mercado
authors.forename: María V
authors.initials: MV
authors.lastname: Coll Aráoz
authors.forename: Alfredo
authors.initials: A
authors.lastname: Grau
authors.forename: César A N
authors.initials: CA
authors.lastname: Catalán
mesh_terms: D000144:Acids, Acyclic / Q000737:chemistry*; D019659:Asteraceae / Q000737:chemistry*; D004224:Diterpenes / Q000737:chemistry*; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*
chemical_list: D000144:Acids, Acyclic; D004224:Diterpenes