New Cytotoxic Steroids from the Indian Ocean Sponge Axinella cf. bidderi

New Cytotoxic Steroids from the Indian Ocean Sponge <i>Axinella </i>cf<i>. </i><i>b</i><i>idderi</i> Yardenone A and B:  New Cytotoxic Triterpenes from the Indian Ocean Sponge <i>Axinella cf. </i><i>b</i><i>idderi</i> Novel Cytotoxic Oxygenated C29 Sterols from the Colombian Marine Sponge <i>Polymastia </i><i>t</i><i>enax</i> Steroids and alkaloids from the South China Sea spongeAxinellasp. 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 polyoxygenated steroids from the sponge Dysidea incrustans Four New Bioactive Pyrrole-Derived Alkaloids from the Marine Sponge <i>Axinella</i> <i>b</i><i>revistyla</i> A New Cytotoxic Sterol Methoxymethyl Ether from a Deep Water Marine Sponge <i>Scleritoderma</i> sp. cf. <i>paccardi</i> Axinellamide, a new alkaloid from the marine sponge axinella sp.