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Name the molecular formula for the molecule established as 1-(4-fluorophenyl)-3-[(2S,3S,6R)-2-(hydroxymethyl)-6-(2-oxo-2-piperidin-1-ylethyl)-3,6-dihydro-2H-pyran-3-yl]urea using the IUPAC nomenclature.
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C20H26FN3O4
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