You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance tert-butyl 4-[4-(2,3-dihydro-1,4-benzoxazin-4-yl)-4-oxobutanoyl]piperazine-1-carboxylate .
user
C21H29N3O5
assistant