You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(3,5-diethyl-1-methylpyrazol-4-yl)methyl]-2-methyl-3-(2-pyridin-2-ylethyl)guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H29IN6
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