You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-[(4-methylphenyl)methyl]-5-[(3S)-1-(2-methylpropanoyl)piperidin-3-yl]-6H-triazolo[4,5-d]pyrimidin-7-one is given. What is its corresponding molecular formula?
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C21H26N6O2
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