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Under IUPAC nomenclature, a molecule named methyl (4R,5S)-2-[4-(4-fluorophenyl)piperazin-1-yl]-4-(furan-2-yl)-6-oxo-4,5-dihydro-1H-pyrimidine-5-carboxylate is given. What is its corresponding molecular formula?
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C20H21FN4O4
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