5,6:8,9-Diepoxy and Other Cytotoxic Sterols from the Marine Sponge Homaxinella sp.

5,6:8,9-Diepoxy and Other Cytotoxic Sterols from the Marine Sponge <i>Homaxinella</i> sp. Cytotoxic Sterol Derivatives from a Marine Sponge <i>Homaxinella </i>sp. New Cytotoxic Metabolites from a Marine Sponge <i>Homaxinella </i>sp. Novel Cytotoxic Oxygenated C29 Sterols from the Colombian Marine Sponge <i>Polymastia </i><i>t</i><i>enax</i> 26,27-Cyclosterols and Other Polyoxygenated Sterols from a Marine Sponge <i>Topsentia</i> sp. New cytotoxic polyoxygenated steroids from the sponge Dysidea incrustans New Cytotoxic Steroids from the Indian Ocean Sponge <i>Axinella </i>cf<i>. </i><i>b</i><i>idderi</i> New Lysophosphatidylcholines and Monoglycerides from the Marine Sponge <i>Stelletta </i>sp. New Lysophosphatidylcholines and Monoglycerides from the Marine Sponge <i>Stelletta </i>sp. C29 sterols with a cyclopropane ring at C-25 and 26 from the Vietnamese marine sponge Ianthella sp. and their anticancer properties