title: Cyclohaliclonamines A-E: dimeric, trimeric, tetrameric, pentameric, and hexameric 3-alkyl pyridinium alkaloids from a marine sponge Haliclona sp.
abstract: A mixture of cyclohaliclonamines A-E (1-5), novel dimeric, trimeric, tetrameric, pentameric, and hexameric 3-alkylpyridinium alkaloids, was obtained from an Okinawan sponge Haliclona sp. Cyclohaliclonamines C-E are the first tetrameric, pentameric, and hexameric 3-alkylpyridinium alkaloids from natural sources. The structure determination of cyclohaliclonamines is discussed in detail.
authors.affiliation: Department of Chemistry, University of Tsukuba, Tennoudai, Tsukuba 305-8571, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Teruya
authors.forename: Keiko
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Kiyotake
authors.initials: K
authors.lastname: Suenaga
authors.forename: Hideo
authors.initials: H
authors.lastname: Kigoshi
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000302:isolation & purification*; D000818:Animals; D007564:Japan; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D011161:Porifera / Q000737:chemistry*; D011726:Pyridinium Compounds / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D000470:Alkaloids; D011726:Pyridinium Compounds