You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-[[N-[2-(N-ethyl-3-methylanilino)ethyl]-N'-methylcarbamimidoyl]amino]piperidine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H35N5O2
assistant