You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(10aR)-7,7-dimethyl-3,3a,5,6,6a,8,9,10-octahydrobenzo[h][2]benzofuran-1,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H20O3
assistant