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-(1-butylpiperidin-4-yl)-3-ethyl-2-[[4-(1-phenylethylamino)oxan-4-yl]methyl]guanidine is given. What is its corresponding molecular formula?
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C26H45N5O
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