You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[2-(cyclopropylamino)-5-(pyrrolidine-1-carbonyl)pyrimidin-4-yl]ethyl]-2-fluoro-5-methylbenzenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26FN5O3S
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