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 (2R)-2-(2-fluoro-N-methylsulfonylanilino)-N-[(1R)-1-(4-methoxy-3-methylphenyl)propyl]propanamide is given. What is its corresponding molecular formula?
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C21H27FN2O4S
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