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 15-[4-(9H-fluoren-9-yl)phenyl]-8-oxa-1,14-diazatetracyclo[7.6.1.02,7.013,16]hexadeca-2,4,6,9,11,13(16),14-heptaene .
user
C32H20N2O
assistant