You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,3-dihydro-1-benzofuran-2-ylmethyl)-1-[2-(1,3-dioxoisoindol-2-yl)ethyl]-3-ethylguanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H25IN4O3
assistant