You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[(4-fluorophenyl)methyl]-3-[(5-pyrrolidin-1-ylsulfonylpyridin-2-yl)amino]pyrrolidin-2-one into molecular formula.
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C20H23FN4O3S
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