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-(benzylsulfamoyl)ethyl]-3-[[1-(3-chlorophenyl)cyclopropyl]methyl]-2-methylguanidine is given. What is its corresponding molecular formula?
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C21H27ClN4O2S
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