You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-[[(1S)-1-[4-chloro-2-fluoro-3-(pyridine-3-carbonyl)phenyl]propyl]amino]-3-methylbutanamide is given. What is its corresponding molecular formula?
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C20H23ClFN3O2
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