title: Cytotoxic flavanones of Schizolaena hystrix from the Madagascar rainforest.
abstract: Bioassay-guided fractionation of an ethanol extract of a Madagascar collection of Schizolaena hystrix afforded three new flavanones, schizolaenone A (1), schizolaenone B (2), and 4'-O-methylbonannione A (3), as well as three known flavanones, nymphaeol A, bonannione A, and macarangaflavanone B, and the flavanol bonanniol A. The structures of compounds 1-3 were determined by various one- and two-dimensional NMR techniques. All of the isolates were tested for cytotoxicity against the A2780 human ovarian cancer cell line. Nymphaeol A (IC(50) = 5.5 microg/mL) exhibited the greatest cytotoxicity, while the other flavanones were found to be only weakly active.
authors.affiliation: Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0212, USA.
authors.forename: Brian T
authors.initials: BT
authors.lastname: Murphy
authors.forename: Shugeng
authors.initials: S
authors.lastname: Cao
authors.forename: Andrew
authors.initials: A
authors.lastname: Norris
authors.forename: James S
authors.initials: JS
authors.lastname: Miller
authors.forename: Fidisoa
authors.initials: F
authors.lastname: Ratovoson
authors.forename: Rabodo
authors.initials: R
authors.lastname: Andriantsiferana
authors.forename: Vincent E
authors.initials: VE
authors.lastname: Rasamison
authors.forename: David G I
authors.initials: DG
authors.lastname: Kingston
mesh_terms: D044950:Flavanones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006801:Humans; D020128:Inhibitory Concentration 50; D008270:Madagascar; D015394:Molecular Structure; D014197:Trees / Q000737:chemistry*; D014407:Tumor Cells, Cultured
chemical_list: C499928:4'-O-methylbonannione A; D044950:Flavanones; C499925:schizolaenone A; C499926:schizolaenone B