You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[[3-ethyl-5-[[(2R)-1-hydroxy-3-methylbutan-2-yl]amino]triazolo[4,5-d]pyrimidin-7-yl]amino]methyl]-6-methoxyphenol into its molecular formula.
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C19H27N7O3
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