title: Viscosamine: the first naturally occurring trimeric 3-alkyl pyridinium alkaloid.
abstract: [structure: see text] Pyridinium alkaloids are widely distributed in marine sponges of different genera. Chemical investigation of the Arctic sponge Haliclona viscosa led to the isolation of a new trimeric 3-alkyl pyridinium alkaloid (viscosamine). Trimers have not been described as natural products yet. The isolation and the structure elucidation of viscosamine are discussed in detail.
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000302:isolation & purification*; D000818:Animals; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D011161:Porifera / Q000737:chemistry; D011726:Pyridinium Compounds / Q000737:chemistry* / Q000302:isolation & purification*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: D000470:Alkaloids; D011726:Pyridinium Compounds; C482411:Viscosamine