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 3-(3-chlorophenyl)-N-[(1-ethyl-3,5-dimethylpyrazol-4-yl)methyl]-N-(2-methylpropyl)prop-2-enamide is given. What is its corresponding molecular formula?
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C21H28ClN3O
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