Halichondramine, a New Tetracyclic Bipiperidine Alkaloid from the Marine Sponge Halichondria sp.

Halichondramine, a New Tetracyclic Bipiperidine Alkaloid from the Marine Sponge Halichondria sp. 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 Amphimedon sp. Tetradehydrohalicyclamine A and 22-Hydroxyhalicyclamine A, New Cytotoxic Bis-piperidine Alkaloids from a Marine Sponge <i>Amphimedon</i> sp. Two New Haliclamines from the Arctic Sponge Haliclona viscosa Halichonines A, B, and C, novel sesquiterpene alkaloids from the marine sponge Halichondria okadai Kadota New haliclamines E and F from the Arctic sponge Haliclona viscosa Haliclocyclin C, a New Monomeric 3-Alkyl Pyridinium Alkaloid from the Arctic Marine Sponge Haliclona viscosa New haliclamines E and F from the Arctic sponge Haliclona viscosa Haliclocyclin C, a New Monomeric 3-Alkyl Pyridinium Alkaloid from the Arctic Marine Sponge Haliclona viscosa