You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule tert-butyl 3-[[N'-[[4-[(2-amino-2-oxoethyl)carbamoyl]phenyl]methyl]-N-ethylcarbamimidoyl]amino]azetidine-1-carboxylate .
user
C21H32N6O4
assistant