You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name benzyl-[(2S,3S,5R)-2-(hydroxymethyl)-5-[6-(2-methylpropanoylamino)purin-9-yl]oxolan-3-yl]carbamic acid into its molecular formula.
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C22H26N6O5
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