6,6,9a-Trimethyl-5,5a,6,7,8,9,9a,9b-octa-hydro-naphtho[1,2-c]furan-1(3H)-one.

In the crystal structure of the title compound, C15H22O2, the cyclo­hexene and cyclo­hexane rings adopt half-boat and chair conformations, respectively, and the lactone ring is in an envelope conformation.