You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3a,6-dimethyl-3,4,5,5a,6,7,8,9,9a,9b-decahydro-1H-benzo[e][2]benzofuran The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H24O
assistant