<jats:p>The first representatives of a new class of eremophilone dimers have been isolated from the wood oil of Eremophila mitchelli and shown by a combination of spectroscopic and X-ray techniques to possess the unusual 1-(8',8'a-dimethylperhydronaphthalen-2'-yl)-1,4,5,10a-tetramethylperhydroanthracene carbon skeleton. These two natural products are the first C30 compounds to be isolated from any member of the genus Eremophila.