A series of new diterpenes from the brown alga Dilophus marginatus (Dictyotaceae)

Abstract

The dichloromethane extract of the brown alga Dilophus marginatus has yielded 17 new diterpenes. Nine of these metabolites were found to possess a new bicyclic diterpene skeleton which we have named secospatane, five had the recently reported spatane skeleton whilst three compounds had a new tricyclic diterpene skeleton.