You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named methyl 4-chloro-3-[[2-(5-chloro-2-methyl-N-methylsulfonylanilino)acetyl]amino]benzoate is given. What is its corresponding molecular formula?
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C18H18Cl2N2O5S
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