You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 5-methyl-1-propan-2-yl-6-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy]pyrazolo[3,4-d]pyrimidin-4-one into molecular formula.
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C21H27BN4O4
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