You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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3-(3-methoxyphenyl)-N-methyl-N-[(3-phenyl-1,2,4-oxadiazol-5-yl)methyl]pyrazolidine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
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C21H23N5O3
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