You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name 6-[cyclopropyl-[[5-[(1S,2R)-2-methylcyclopropyl]furan-2-yl]methyl]amino]-1-methyl-5H-pyrazolo[3,4-d]pyrimidin-4-one into its molecular formula.
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C18H21N5O2
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