You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[[1-(2-methoxyethyl)cyclobutyl]methyl]-2-[(1-phenylpyrazol-4-yl)methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32IN5O
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