You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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3-[2-[(2S)-2-[(3,5-dimethylpyrazol-1-yl)methyl]pyrrolidin-1-yl]-2-oxoethyl]imidazolidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
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C15H21N5O3
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