New Cytotoxic Steroidal Alkaloids from the Philippine Sponge Corticium niger

New Cytotoxic Steroidal Alkaloids from the Philippine Sponge <i>Corticium </i><i>n</i><i>iger</i> New Cytotoxic Steroidal Alkaloids from the Philippine Sponge <i>Corticium </i><i>n</i><i>iger</i> Minor Steroidal Alkaloids from the Marine Sponge <i>Corticium</i> sp. Minor Steroidal Alkaloids from the Marine Sponge Corticium sp. New Steroidal Alkaloids from an Undescribed Sponge of the Genus <i>Corticium</i> Steroidal Alkaloids from the Marine Sponge <i>Corticium niger</i> That Inhibit Growth of Human Colon Carcinoma Cells Steroidal Alkaloids from the Marine Sponge <i>Corticium niger</i> That Inhibit Growth of Human Colon Carcinoma Cells Isolation of Plakinamine I: A New Steroidal Alkaloid from the Marine Sponge Corticium sp. and Synthesis of an Analogue Model Compound Plakinamines C and D and Three Other New Steroidal Alkaloids from the SpongeCorticium sp. Plakinamines C and D and Three Other New Steroidal Alkaloids from the SpongeCorticium sp.