title: New coumarins from Pterocaulon polystachyum.
abstract: Aerial parts of Pterocaulon polystachyum from Chaco province, Argentina, afforded the known coumarins ayapin, isoscopoletin, prenyletin, prenyletin methyl ether, virgatenol, obtusinin, 5-methoxy-6,7-methylenedioxycoumarin, 5-(3,3-dimethylallyloxy)-6,7-methylenedioxycoumarin, 5-(2',3'-dihydroxy-3-methylbutanoxy)-6,7-methylenedioxycoumarin, haplopinol methyl ether, 6-(1,1-dimethyl-2-propenyl)-7-hydroxycoumarin and demethylnieshoutin; the last two are new as natural products while the five new coumarins from the collection were isovirgatenol, 3'-deoxyobtusinin, 6-methoxy-7-(2'-hydroxyethoxy)-coumarin, 5-(2'-hydroxyethoxy)-6,7-methylenedioxycoumarin and a substance tentatively identified as 5-hydroxy-6,7-methylenedioxy-8-(3,3-dimethylallyl)-coumarin.
authors.forename: N
authors.initials: N
authors.lastname: Vera
authors.forename: A
authors.initials: A
authors.lastname: Bardón
authors.forename: C A
authors.initials: CA
authors.lastname: Catalán
authors.forename: T E
authors.initials: TE
authors.lastname: Gedris
authors.forename: W
authors.initials: W
authors.lastname: Herz
mesh_terms: D001118:Argentina; D019659:Asteraceae; D003374:Coumarins / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D010946:Plants, Medicinal
chemical_list: D003374:Coumarins; D010936:Plant Extracts