You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-1-[[2-[(2-methylpropan-2-yl)oxy]phenyl]methyl]-3-[(1-methylpyrazol-4-yl)methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H28IN5O
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