title: Euplectin and coneuplectin, new naphthopyrones from the lichen Flavoparmelia euplecta.
abstract: Two new naphthopyrones, euplectin (1) and coneuplectin (2), have been isolated from the lichen Flavoparmelia euplecta and their structures elucidated using multidimensional NMR spectroscopic methods, including highfield (600 MHz) gHMBC and gNOE experiments. Cytotoxicity of the more abundant naphthopyrone (1) against the murine P-815 mastocytoma cell line (IC(50) ca. 1.67 microg/mL) has also been evaluated. These compounds are the first lichen metabolites known to contain indenone or indanone moieties in their structure. F. euplecta was also found to contain the known metabolites usnic acid, protocetraric acid, and skyrin.
authors.affiliation: Department of Chemistry, The Faculties, Australian National University, Canberra, ACT, 0200 Australia.
authors.forename: M A
authors.initials: MA
authors.lastname: Ernst-Russell
authors.forename: C L
authors.initials: CL
authors.lastname: Chai
authors.forename: J H
authors.initials: JH
authors.lastname: Wardlaw
authors.forename: J A
authors.initials: JA
authors.lastname: Elix
mesh_terms: D002455:Cell Division / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010944:Plants / Q000737:chemistry*; D011753:Pyrones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D011753:Pyrones