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-chloro-4-nitro-N-[2-[(2-propan-2-yloxypyridin-3-yl)methylcarbamoyl]phenyl]benzamide is given. What is its corresponding molecular formula?
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C23H21ClN4O5
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