You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-ethyl-N-[(2S)-1-[4-(ethylsulfamoyl)anilino]-1-oxo-3-phenylpropan-2-yl]-4-fluorobenzamide by IUPAC nomenclature, provide its molecular formula.
user
C26H28FN3O4S
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