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 2-[(3-chloro-4-ethoxyphenyl)sulfonyl-methylamino]-N-[4-(trifluoromethyl)phenyl]acetamide is given. What is its corresponding molecular formula?
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C18H18ClF3N2O4S
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