You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[2-(2,3-dihydroindol-1-ylsulfonyl)ethyl]-3-[2-(4-fluorophenoxy)propyl]-2-methylguanidine;hydroiodide .
user
C21H28FIN4O3S
assistant