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 1-[(2S)-2-[(1S)-1-hydroxy-1-(4-methoxyphenyl)ethyl]pyrrolidin-1-yl]-3-(1-methylpyrazol-4-yl)propan-1-one is given. What is its corresponding molecular formula?
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C20H27N3O3
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