You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3-chlorophenyl)methyl]-2-(2,4-dichlorophenoxy)-N-[(3R)-1,1-dioxothiolan-3-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H18Cl3NO4S
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