You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(cyclopropylmethoxy)ethyl]-2-methyl-3-[(3-methyl-1-benzofuran-2-yl)methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H26IN3O2
assistant