You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-butyl-3-[2-(furan-2-yl)ethyl]-2-[[3-(2-hydroxyethyl)oxolan-3-yl]methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H32IN3O3
assistant