You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-tert-butyl-1-methyl-4-[4-(pyridin-3-ylmethoxy)piperidin-1-yl]pyrazolo[3,4-d]pyrimidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H28N6O
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