You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(3,4-dichlorophenyl)methyl]-2-[2-(diethylamino)-2-oxoethyl]sulfanyl-N-methylacetamide by IUPAC nomenclature, provide its molecular formula.
user
C16H22Cl2N2O2S
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