You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[1-[4-chloro-2-(trifluoromethyl)anilino]-1-oxopropan-2-yl]sulfanylphenyl]pentanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22ClF3N2O2S
assistant