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 (2S)-N-cyclopentyl-2-methyl-1-[(2-methylphenyl)methyl]-5-oxopyrrolidine-2-carboxamide is given. What is its corresponding molecular formula?
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C19H26N2O2
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