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-[5-[bis(dimethylamino)methylideneamino]-1,8-dioxido-1,8-naphthyridine-1,8-diium-4-yl]-1,1,3,3-tetramethylguanidine is given. What is its corresponding molecular formula?
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C18H28N8O2
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