You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[6'-acetyloxy-5-(chloromethyl)-2',7'-difluoro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3'-yl] acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H15ClF2O7
assistant