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-[3-(methanesulfonamido)propyl]-2-[(3-methyl-4-methylsulfonylphenyl)methyl]guanidine is given. What is its corresponding molecular formula?
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C16H28N4O4S2
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