You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[(2R)-4-[(2R)-6-bromo-13-chloro-4-azatricyclo[9.4.0.03,8]pentadeca-1(11),3(8),4,6,12,14-hexaen-2-yl]-1-methylpiperazin-2-yl]ethanone into its molecular formula.
user
C21H23BrClN3O
assistant