You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(1-cyclopropylpyrrolidin-3-yl)methyl]-2-methyl-3-[2-(4-methylphenyl)propyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H33IN4
assistant