You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-ethoxy-6-methylpyridin-2-yl)-[1-[[(5-methylpyrimidin-2-yl)amino]methyl]-2-azabicyclo[2.2.1]heptan-2-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
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C21H27N5O2
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