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 2-[(4-methoxy-5,6,7,8-tetrahydronaphthalen-1-yl)methyl]-1-pyrrolidin-1-ylbutan-1-one is given. What is its corresponding molecular formula?
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C20H29NO2
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