A tetracyclic diamine alkaloid, halicyclamine A, from the marine sponge Haliclona sp

A tetracyclic diamine alkaloid, halicyclamine A, from the marine sponge Haliclona sp Haliclorensin, a Novel Diamino Alkaloid from the Marine Sponge <i>Haliclona </i><i>t</i><i>ulearensis</i> Haliclorensin, a Novel Diamino Alkaloid from the Marine Sponge <i>Haliclona </i><i>t</i><i>ulearensis</i> The structure and biogenetic origin of (-) halicyclamine B from a Xestospongia sponge Cyclohaliclonamines A−E:  Dimeric, Trimeric, Tetrameric, Pentameric, and Hexameric 3-Alkyl Pyridinium Alkaloids from a Marine Sponge Haliclona sp. Tetradehydrohalicyclamine A and 22-Hydroxyhalicyclamine A, New Cytotoxic Bis-piperidine Alkaloids from a Marine Sponge Amphimedon sp. Tetradehydrohalicyclamine A and 22-Hydroxyhalicyclamine A, New Cytotoxic Bis-piperidine Alkaloids from a Marine Sponge <i>Amphimedon</i> sp. Halichondramine, a New Tetracyclic Bipiperidine Alkaloid from the Marine Sponge Halichondria sp. Haliclocyclin C, a New Monomeric 3-Alkyl Pyridinium Alkaloid from the Arctic Marine Sponge Haliclona viscosa Cyclic 3-Alkyl Pyridinium Alkaloid Monomers from a New Zealand <i>Haliclona</i> sp. Marine Sponge