You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[4-chloro-2-(trifluoromethyl)phenyl]-2-[5-(diethylsulfamoyl)-2,3-dihydroindol-1-yl]acetamide into its molecular formula.
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C21H23ClF3N3O3S
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