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 (2R,11E)-6-chloro-17-hydroxy-2-phenyl-9-oxa-1,14,21-triazatetracyclo[12.7.1.03,8.016,21]docosa-3(8),4,6,11,16,19-hexaene-15,18-dione .
user
C24H20ClN3O4
assistant