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-tert-butylsulfinylethyl)-3-ethyl-2-[3-(4-fluorophenyl)sulfanylpropyl]guanidine is given. What is its corresponding molecular formula?
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C18H30FN3OS2
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