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system
Provide the molecular formula for the IUPAC named substance [(1R,2R,4R,5R)-4-[6-(cyclopentylamino)purin-9-yl]-1,5-dihydroxy-6,6-dimethyl-3-oxabicyclo[3.1.0]hexan-2-yl]methyl nitrate .
user
C18H24N6O6
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