You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[(2S,3R,4R)-1-acetyl-2-cyclopropyl-6-fluoro-3-methyl-3,4-dihydro-2H-quinolin-4-yl]amino]pyridine-3-carboxamide into molecular formula.
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C21H23FN4O2
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