You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (3R,3aR,6aS,10aS)-3-hydroxy-5-oxo-3a,4,6,6a,7,8,9,10-octahydro-1H-benzo[d][2]benzofuran-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H20O5
assistant