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 N-[[1-(2-methyl-5-nitrobenzoyl)piperidin-3-yl]methyl]pyrrolidine-2-carboxamide;hydrochloride is given. What is its corresponding molecular formula?
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C19H27ClN4O4
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