You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[(3S)-3-cyano-3-cyclopropyl-2-oxopyrrolidin-1-yl]-N-[[3-fluoro-5-(5-methylpyridin-3-yl)phenyl]methyl]-6-methylpyridine-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C28H26FN5O2
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