You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-methyl-1-[3-(5-methylfuran-2-yl)-1-phenylpyrazole-4-carbonyl]pyrrolidine-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C21H21N3O4
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