title: Bioactive phenolic compounds from a medicinal lichen, Usnea longissima.
abstract: Natural products, longissiminone A (1) and longissiminone B (2), were isolated along with a known compound, glutinol (3), from a medicinal lichen, Usnea longissima. The structures of compounds 1 and 2 were determined with the help of spectroscopic studies. Compound 1 was found to possess potent anti-inflammatory activity in a cell-based contemporary assay. Cytotoxicity activity measured by cell viability assay showed 100% viability in the presence of 200 microg/mL conc. of these compounds.
authors.affiliation: H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi 75270, Pakistan. hej@cyber.net.pk
authors.forename: Muhammad I
authors.initials: MI
authors.lastname: Choudhary
authors.lastname: Azizuddin
authors.forename: Saima
authors.initials: S
authors.lastname: Jalil
authors.lastname: Atta-ur-Rahman
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology / Q000633:toxicity; D001555:Benzene Derivatives / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology / Q000633:toxicity; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D006801:Humans; D015394:Molecular Structure; D009504:Neutrophils / Q000187:drug effects; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology / Q000633:toxicity; D020949:Usnea / Q000737:chemistry*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001555:Benzene Derivatives; D014315:Triterpenes; C506419:glutinol; C506417:longissiminone A; C506418:longissiminone B