You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[2-(1-benzothiophen-2-yl)-2-hydroxyethyl]-3-[[2-(methoxymethyl)phenyl]methyl]-2-methylguanidine;hydroiodide .
user
C21H26IN3O2S
assistant