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system
Name the molecular formula for the molecule established as [(2R,3R,4R,5R)-5-[4-amino-5-(2-pyridin-2-ylethynyl)pyrrolo[2,3-d]pyrimidin-7-yl]-3,4-dihydroxy-4-methyloxolan-2-yl]methyl dihydrogen phosphate using the IUPAC nomenclature.
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C19H20N5O7P
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