You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-methyl-1-[(1-methyl-2-thiophen-2-ylpiperidin-3-yl)methyl]-3-propan-2-ylguanidine;hydroiodide into molecular formula.
user
C16H29IN4S
assistant