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-(2,3-dihydro-1H-inden-1-ylmethyl)-3-[[3-(methanesulfonamido)phenyl]methyl]-2-methylguanidine;hydroiodide .
user
C20H27IN4O2S
assistant