You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-chloro-5-[(6-fluoropyridin-2-yl)methylsulfonyl]-N-[[2-fluoro-6-(pyrrolidin-1-ylmethyl)phenyl]methyl]pyridin-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
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C23H23ClF2N4O2S
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