Phorbaketals L–N, cytotoxic sesterterpenoids isolated from the marine sponge of the genus Phorbas

Phorbaketals L–N, cytotoxic sesterterpenoids isolated from the marine sponge of the genus Phorbas Bioactive Sesterterpenoids from a Korean Sponge <i>Monanchora</i> sp. Three New Cytotoxic Sesterterpenes from a Marine Sponge <i>Spongia </i>sp. Phorbasterones A−D, Cytotoxic <i>Nor</i>-Ring A Steroids from the Sponge <i>Phorbas amaranthus</i> New cytotoxic sesterterpenes from the New Caledonian marine sponge Petrosaspongia nigra (Bergquist) Gukulenins A and B, Cytotoxic Tetraterpenoids from the Marine Sponge <i>Phorbas gukulensis</i> Polyoxygenated Diterpenes from the Sponge <i>Phorbas</i> sp. Three New Cytotoxic Sesterterpenes from the Marine Sponge <i>Hyrtios</i> cf. <i>erectus</i> Thorectandrols A and B, New Cytotoxic Sesterterpenes from the Marine Sponge <i>Thorectandra</i> Species Phorboxazoles A and B: potent cytostatic macrolides from marine sponge Phorbas species