You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
14-phenyl-5-[10-(9-phenylcarbazol-2-yl)phenanthren-9-yl]-3-oxa-15-azapentacyclo[11.8.0.02,10.04,9.016,21]henicosa-1(13),2(10),4(9),5,7,11,14,16,18,20-decaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C57H34N2O
assistant