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 4-[[1-methyl-5-(2-oxopiperidin-1-yl)benzimidazol-2-yl]methylamino]benzenecarboximidamide is given. What is its corresponding molecular formula?
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C21H24N6O
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