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Name the molecular formula for the molecule established as 3-[(2R,3S,4R,5R)-4-[tert-butyl(dimethyl)silyl]oxy-3-fluoro-5-(hydroxymethyl)oxolan-2-yl]-4H-imidazo[1,2-a]purin-9-one using the IUPAC nomenclature.
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C18H26FN5O4Si
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