New spongian diterpenoids from a great barrier reef sponge, Spongia sp
摘要:
Four new spongian diterpenes, 4-6 and 8, have been isolated from a Spongia sp. of sponge collected on the Great Barrier Reef. Two of the diterpenes have ring-A lactones instead of the conventional cyclohexane rings. Structures were determined primarily by proton and carbon-13 NMR analyses. One of the metabolites is slightly cytotoxic to murine leukemia cells.