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-[4-(4-benzylpiperidin-1-yl)butyl]-2-methyl-3-(3,3,3-trifluoropropyl)guanidine is given. What is its corresponding molecular formula?
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C21H33F3N4
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