You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2-fluoro-4-propoxyphenyl)methyl]-2-(4-oxo-1,5,6,7-tetrahydrocyclopenta[b]pyridin-3-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
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C20H23FN2O3
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