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Convert the IUPAC name of a molecule 2-[[(2R,3R,4S,5R)-5-(6-amino-2-chloropurin-9-yl)-4-fluoro-3-hydroxyoxolan-2-yl]methoxy]-2-[(5-carboxy-1-methylpyrazol-3-yl)methyl]propanedioic acid into molecular formula.
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C19H19ClFN7O9
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