Gelliusterols A−D, New Acetylenic Sterols from a Sponge, Gellius Species

Gelliusterols A−D, New Acetylenic Sterols from a Sponge, <i>Gellius</i> Species New Acetylenic Enol Ethers of Glycerol from the Sponge <i>Petrosia</i> sp. New Acetylenic Acids from a Sponge of the Genus <i>Stelletta</i> Antichlamydial Sterol from the Red Sea Sponge Callyspongia aff. implexa Oculatol, Oculatolide, and A-nor Sterols from the Sponge <i>Haliclona oculat</i>a Steroids and alkaloids from the South China Sea spongeAxinellasp. A new aldehydic carotenoid gelliodesxanthin from sea sponge Gelliodes callista. New Cytotoxic Steroids from the Indian Ocean Sponge <i>Axinella </i>cf<i>. </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> Stellettins L and M, Cytotoxic Isomalabaricane-Type Triterpenes, and Sterols from the Marine Sponge Stelletta tenuis