You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[2-[3-(furan-2-yl)-1H-1,2,4-triazol-5-yl]ethyl]-2-([1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl)guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H22IN9O
assistant