You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[1-[(4,5-dimethyl-1,3-oxazol-2-yl)methyl]piperidin-4-yl]methyl]-4,5-dimethylpyrimidin-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
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C18H27N5O
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