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 N-[2-[4-(5-bromo-2-chlorobenzoyl)piperazin-1-yl]ethyl]-1,3-benzodioxole-5-carboxamide .
user
C21H21BrClN3O4
assistant