You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 1-[2-(3,4-dihydro-1H-isoquinolin-2-yl)-2-oxoethyl]-2-methyl-3-(4-methylsulfanylbutyl)guanidine;hydroiodide ?
user
C18H29IN4OS
assistant