You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-nitro-N-[4-[2-oxo-1-phenyl-2-(2,3,5,6-tetrafluoroanilino)ethyl]sulfanylphenyl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H17F4N3O4S
assistant