You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 1-[N'-methyl-N-[[2-[(2-methylpropan-2-yl)oxy]phenyl]methyl]carbamimidoyl]piperidine-4-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H33N3O3
assistant