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-ethyl-3-[2-(4-methylsulfonylphenyl)ethyl]-2-[4-(1,2,4-triazol-4-yl)butyl]guanidine is given. What is its corresponding molecular formula?
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C18H28N6O2S
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