You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as tert-butyl N-[3-[[[N'-[(5-tert-butyl-1,2,4-oxadiazol-3-yl)methyl]-N-ethylcarbamimidoyl]amino]methyl]pentan-3-yl]carbamate using the IUPAC nomenclature.
user
C21H40N6O3
assistant