You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclopropyl-4-[[N-[[2-(2-ethoxyethoxy)-4-methylphenyl]methyl]-N'-methylcarbamimidoyl]amino]butanamide;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H35IN4O3
assistant