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 N-[[1-(5-chloro-2-methylphenyl)pyrrolidin-3-yl]methyl]-3-hydroxy-4-methylpentanamide is given. What is its corresponding molecular formula?
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C18H27ClN2O2
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