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 N-butan-2-yl-3-[[(E)-3-[4-(ethylsulfamoyl)phenyl]prop-2-enoyl]amino]propanamide is given. What is its corresponding molecular formula?
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C18H27N3O4S
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