You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-[[N-[2-(5-bromothiophen-2-yl)ethyl]-N'-methylcarbamimidoyl]amino]piperidine-1-carboxylate;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H26BrIN4O2S
assistant