The structure and biogenetic origin of (-) halicyclamine B from a Xestospongia sponge

The structure and biogenetic origin of (-) halicyclamine B from a Xestospongia sponge A tetracyclic diamine alkaloid, halicyclamine A, from the marine sponge Haliclona sp Tetradehydrohalicyclamine A and 22-Hydroxyhalicyclamine A, New Cytotoxic Bis-piperidine Alkaloids from a Marine Sponge <i>Amphimedon</i> sp. Tetradehydrohalicyclamine A and 22-Hydroxyhalicyclamine A, New Cytotoxic Bis-piperidine Alkaloids from a Marine Sponge Amphimedon sp. Revised structure of xestocyclamine A and description of a new analogue 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 haliclonacyclamines, cytotoxic tertiary alkaloids from the tropical marine sponge Haliclona sp Halichondramine, a New Tetracyclic Bipiperidine Alkaloid from the Marine Sponge Halichondria sp. Cyclohaliclonamines A−E:  Dimeric, Trimeric, Tetrameric, Pentameric, and Hexameric 3-Alkyl Pyridinium Alkaloids from a Marine Sponge Haliclona sp.