Benzopyrans from Hypericum polyanthemum.
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.
Ferraz
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Programa de Pós Graduação em Ciências Farmacêuticas, UFRGS. Av. Ipiranga, 2752, 90610-000, RS, Porto Alegre, Brazil.
Bordignon
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Staats
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Schripsema
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Lino von Poser
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D001578:Benzopyrans / Q000737:chemistry / Q000302:isolation & purification*; D001938:Brazil; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000737:chemistry*
D001578:Benzopyrans