You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-methyl-1-[N'-methyl-N-[[4-(2-oxopyrrolidin-1-yl)phenyl]methyl]carbamimidoyl]pyrrolidine-3-carboxylate;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H29IN4O3
assistant