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-[2-(2,4-dioxo-1,3-diazaspiro[4.4]nonan-3-yl)ethyl]-2-(2-methylpropyl)guanidine is given. What is its corresponding molecular formula?
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C14H25N5O2
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