You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(3,4-dichlorophenyl)ethyl]-2-[2-(diethylamino)-2-oxoethyl]sulfanylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H22Cl2N2O2S
assistant