You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[1-(4-ethylphenyl)ethyl]-2-methyl-3-[[1-methyl-3-(trifluoromethyl)pyrazol-4-yl]methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H25F3IN5
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