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 2-(5-chloro-2-methoxyphenyl)-N-[5-methyl-2-(4-nitrophenyl)pyrazol-3-yl]acetamide is given. What is its corresponding molecular formula?
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C19H17ClN4O4
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