You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-(2-ethylsulfanylphenyl)-2-(6-fluoro-1H-benzimidazol-2-yl)pyrrolidine-1-carboxamide is given. What is its corresponding molecular formula?
user
C20H21FN4OS
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