title: NMR studies of phakellins and isophakellins.
abstract: Phakellins 3 and 4 and isophakellins 5 and 6 are tetracyclic pyrrole-imidazole alkaloids. Their structure elucidation is herein reviewed using state-of-the-art NMR methods. Special emphasis has been given to the application of ADEQUATE NMR pulse sequences. Furthermore, (15)N NMR chemical shifts, proton T1 relaxation times, and (1)J(CH) coupling constants were determined.
authors.affiliation: Alfred-Wegener-Institut für Polar- and Meeresforschung in der Helmholtz-Gemeinschaft, Am Handelshafen 12, D-27570 Bremerhaven, Germany.
authors.forename: Sven W
authors.initials: SW
authors.lastname: Meyer
authors.forename: Matthias
authors.initials: M
authors.lastname: Köck
mesh_terms: D000470:Alkaloids / Q000737:chemistry*; D000818:Animals; D007093:Imidazoles / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010879:Piperazines / Q000737:chemistry*; D011161:Porifera / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000470:Alkaloids; D007093:Imidazoles; D010879:Piperazines; D011758:Pyrroles; C465248:phakellin