You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[1-(3,4-dichloroanilino)-1-oxopropan-2-yl]sulfanylphenyl]-2-methylbenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H20Cl2N2O2S
assistant