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 10-amino-6-bromo-4-phenylmethoxy-1,8,11-triazatetracyclo[8.6.0.03,8.011,15]hexadeca-3,6-diene-2,5-dione .
user
C20H21BrN4O3
assistant