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-methyl-1-[2-(7-methyl-1H-indol-3-yl)ethyl]-3-[(2-methylthiolan-2-yl)methyl]guanidine is given. What is its corresponding molecular formula?
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C19H28N4S
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