You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name 4-[3-[1-(3-methoxyphenyl)cyclobutyl]-1,2,4-oxadiazol-5-yl]-1-(1-methylpyrazol-4-yl)pyrrolidin-2-one into its molecular formula.
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C21H23N5O3
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