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system
Provide the molecular formula for the IUPAC named substance 4-[(2R,3S,5R)-2-[[bis(4-methoxyphenyl)-phenylmethoxy]methyl]-5-[2-(2-methylpropylamino)-6-oxo-1H-purin-9-yl]oxolan-3-yl]oxy-4-oxobutanoic acid .
user
C39H43N5O9
assistant