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-ethyl-5-(hydroxymethyl)-N-[2-(1H-1,2,4-triazol-5-yl)ethyl]benzenesulfonamide is given. What is its corresponding molecular formula?
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C13H18N4O3S
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