You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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5-methyl-4-N-[2-(5-methyl-1,2,4-oxadiazol-3-yl)ethyl]-2-propylpyrimidine-4,6-diamine is the IUPAC name of a molecule. Please give its molecular formula.
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C13H20N6O
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