You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 4-[[(3R)-3-[5-[2-(2-chlorophenoxy)ethyl]-1H-pyrazol-3-yl]pyrrolidin-1-yl]methyl]-1-ethylpyrazole is given. What is its corresponding molecular formula?
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C21H26ClN5O
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