You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (3S,3aS,9aS)-3,5,5-trimethyl-8-methylidene-1,2,3,3a,6,7,9,9a-octahydrocyclopenta[8]annulen-4-one .
user
C15H24O
assistant