You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 3-methyl-1-[[(1S)-1-(3-methyl-1-benzofuran-2-yl)ethyl]carbamoyl]pyrrolidine-3-carboxylic acid into molecular formula.
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C18H22N2O4
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