title: Sterols of the marine sponge Petrosia weinbergi: implications for the absolute configurations of the antiviral orthoesterols and weinbersterols.
abstract: The marine sponge Petrosia weinbergi was found to contain isofucosterol and clionasterol as its major sterols. The rare cyclopropyl sterol (24S,28S)-24,28-methylenestigmast-5-en-3beta-ol, previously detected as only 0.07% of the total sterols of a pelagophytic alga Pulvinaria sp., made up 6.6% of the total sterols. These sterols are believed to be the biosynthetic precursors of the antiviral orthoesterols and weinbersterols found in the same sponge. Based on the side chains of the isolated sterols, the absolute configurations of the antiviral steroid side chains are assigned to be (24R,28S)- for orthoesterol B, (24R)- for orthoesterol C, and (24S,28S)- for weinbersterols A and B.
authors.affiliation: Department of Chemistry, State University of New York, Environmental Science and Forestry, Syracuse 13210, USA. jlginer@syr.edu
authors.forename: J L
authors.initials: JL
authors.lastname: Giner
authors.forename: S P
authors.initials: SP
authors.lastname: Gunasekera
authors.forename: S A
authors.initials: SA
authors.lastname: Pomponi
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011161:Porifera / Q000737:chemistry*; D013261:Sterols / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000998:Antiviral Agents; D013261:Sterols