You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[1,1,1,2,3,3-hexafluoro-3-(1,2,2-trifluoroethenoxy)propan-2-yl]oxyethanesulfonic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C7H5F9O5S
assistant