8,17-Epoxybriarane Diterpenoids, Briaranolides A−J, from an Okinawan Gorgonian Briareum sp.

Ten new 8,17-epoxybriarane diterpenoids, briaranolides A−J (110), were isolated from an Okinawan gorgonian Briareum sp. The structure of the diterpenoids was determined on the basis of spectroscopic analysis, chemical conversions, and X-ray analysis.