You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule N-[(3R,4S)-1-[2-(3,5-dimethyl-1,2,4-triazol-1-yl)acetyl]-4-phenylpiperidin-3-yl]-3-methoxypropanamide into molecular formula.
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C21H29N5O3
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