You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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6-methyl-2-[(3R)-3-(2-methyl-6-morpholin-4-ylpyrimidin-4-yl)piperidin-1-yl]pyridine-3-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
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C21H26N6O
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