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 (3R)-1-cyclopentyl-N-[2-[(2-methylphenyl)methylsulfanyl]ethyl]-5-oxopyrrolidine-3-carboxamide is given. What is its corresponding molecular formula?
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C20H28N2O2S
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