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-[1-[(2-chlorophenyl)methyl]-3,5-dimethylpyrazol-4-yl]-N-(1,1-dioxothiolan-3-yl)-N-ethylprop-2-enamide is given. What is its corresponding molecular formula?
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C21H26ClN3O3S
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