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 1-N-hexyl-1-N'-[2-[4-(hydroxymethyl)anilino]-2-oxoethyl]cyclobutane-1,1-dicarboxamide is given. What is its corresponding molecular formula?
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C21H31N3O4
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