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system
Name the molecular formula for the molecule established as 1-[3-[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl-methylamino]propyl]-3-(4-hydroxyphenyl)urea using the IUPAC nomenclature.
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C21H28N8O5
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