You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-1-[(1-methylpyrrolidin-2-yl)methyl]-3-(2-phenylsulfanylpropyl)guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H29IN4S
assistant