Studies on the minor constituents of the Caribbean gorgonian octocoral Briareum asbestinum Pallas. Isolation and structure determination of the eunicellin-based diterpenoids briarellins E--I.

Five new eunicellin-type diterpenoids, briarellins E--I, along with several known diterpenoids of the asbestinane, briarane and eunicellane classes, were isolated from the Caribbean gorgonian octocoral Briareum asbestinum collected in Puerto Rico. The structures of these compounds were established on the basis of spectroscopic evidence.