You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(4R)-3-[2-(4-chlorophenyl)ethyl]-5-oxo-2-sulfanylidene-1-[3-(trifluoromethyl)phenyl]imidazolidin-4-yl]-N-(4-fluorophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H20ClF4N3O2S
assistant