You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,1,2,2-tetrafluoro-4-[1,1,1-trifluoro-4-(4-methylphenyl)-3-oxo-2-prop-2-enoyloxybutan-2-yl]oxybutane-1-sulfonic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H17F7O7S
assistant