title: Benzopyrans from Hypericum polyanthemum.
abstract: From the aerial parts of Hypericum polyanthemum Klotzsch ex Reichardt (Guttiferae), three chromenes, 6-isobutyryl-5,7-dimethoxy-2,2-dimethyl-benzopyran; 7-hydroxy-6-isobutyryl-5-methoxy-2,2-dimethyl-benzopyran and 5-hydroxy-6-isobutyryl-7-methoxy-2,2-dimethyl-benzopyran were isolated. Their structures were determined by NMR spectroscopic analyses.
authors.affiliation: Programa de Pós Graduação em Ciências Farmacêuticas, UFRGS. Av. Ipiranga, 2752, 90610-000, RS, Porto Alegre, Brazil.
authors.forename: A B
authors.initials: AB
authors.lastname: Ferraz
authors.forename: S A
authors.initials: SA
authors.lastname: Bordignon
authors.forename: C
authors.initials: C
authors.lastname: Staats
authors.forename: J
authors.initials: J
authors.lastname: Schripsema
authors.forename: G L
authors.initials: GL
authors.lastname: Lino von Poser
mesh_terms: D001578:Benzopyrans / Q000737:chemistry / Q000302:isolation & purification*; D001938:Brazil; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D001578:Benzopyrans