Eunicellanes and Asbestinanes

Eunicellanes and (infrequently) asbestinanes are diterpenes of marine origin, including eunicelline from the alga Eunicella stricta and cladielline found in some Cladiella species. Asbestinanes such as (-)-asbestinine 2 are characteristic of the gorgonia Briareum asbestinum (Araceae). 

Briaranes are found in marine organisms including corals, represented by the brian-theines W and X from Briareum polyanthes. Brianthein X is reported to be an insecticide, while the closely related (-)-solenolide A isolated from Solenopodium species exhibits antiviral and antiinflammatory activities. These briarane lactones are usually referred to as erythrolides. 

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