You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1,1-dioxothiolan-3-yl)-3-ethyl-2-(3-methyl-2-pyrrolidin-1-ylbutyl)guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H33IN4O2S
assistant