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 (5R)-1-[(2S)-2-phenylpropyl]-5-[2-(pyridin-3-ylmethylamino)ethyl]pyrrolidin-2-one is given. What is its corresponding molecular formula?
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C21H27N3O
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