You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (5S,6aR)-5,6a-dibromo-6,6-dimethoxy-3,3-dimethyl-1-oxo-3a,4-dihydrocyclopenta[c]furan-5-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H18Br2O6
assistant