You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S,4S)-4-fluoro-1-[2-[(1-propan-2-ylsulfonylpiperidin-4-yl)amino]acetyl]pyrrolidine-2-carbonitrile into molecular formula.
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C15H25FN4O3S
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