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-chloro-N-[[3-(4-ethylphenyl)-2-oxo-1,3-oxazolidin-5-yl]methyl]benzenesulfonamide is given. What is its corresponding molecular formula?
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C18H19ClN2O4S
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