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 5-[[4-[1-[acetyl(ethyl)amino]propyl]-2,3-difluorophenyl]methyl]pyridine-3-carboxylic acid is given. What is its corresponding molecular formula?
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C20H22F2N2O3
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