You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3aS,4S,5R,6aR)-4-(hydroxymethyl)-2-oxo-3,3a,4,5,6,6a-hexahydrocyclopenta[b]furan-5-yl] benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H16O5
assistant