You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[(3-chlorophenyl)methylsulfanyl]propyl]-2-[N-methylsulfonyl-3-(trifluoromethyl)anilino]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22ClF3N2O3S2
assistant