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-[4-(hydroxymethyl)piperidin-1-yl]-N-(6-piperidin-1-ylpyridin-3-yl)acetamide is given. What is its corresponding molecular formula?
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C18H28N4O2
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