Novel Cytotoxic Oxygenated C29 Sterols from the Colombian Marine Sponge Polymastia tenax

Novel Cytotoxic Oxygenated C29 Sterols from the Colombian Marine Sponge <i>Polymastia </i><i>t</i><i>enax</i> 5,6:8,9-Diepoxy and Other Cytotoxic Sterols from the Marine Sponge <i>Homaxinella</i> sp. 26,27-Cyclosterols and Other Polyoxygenated Sterols from a Marine Sponge <i>Topsentia</i> sp. C29 sterols with a cyclopropane ring at C-25 and 26 from the Vietnamese marine sponge Ianthella sp. and their anticancer properties New Cytotoxic Steroids from the Indian Ocean Sponge <i>Axinella </i>cf<i>. </i><i>b</i><i>idderi</i> Stellettins L and M, Cytotoxic Isomalabaricane-Type Triterpenes, and Sterols from the Marine Sponge Stelletta tenuis New cytotoxic polyoxygenated steroids from the sponge Dysidea incrustans Eurysterols A and B, Cytotoxic and Antifungal Steroidal Sulfates from a Marine Sponge of the Genus <i>Euryspongia</i> Cytotoxic Sterol Derivatives from a Marine Sponge <i>Homaxinella </i>sp. Thorectandrols A and B, New Cytotoxic Sesterterpenes from the Marine Sponge <i>Thorectandra</i> Species