You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(1,3-dioxoisoindol-2-yl)butyl]-3-ethyl-2-(2-hydroxy-2-thiophen-2-ylpropyl)guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H29IN4O3S
assistant