You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-(2-bicyclo[3.1.1]hepta-1,3,5-trienyl)-13-(4-carbazol-9-ylphenyl)-17-phenyl-9,13,17-triazahexacyclo[14.7.0.02,10.03,8.011,15.018,23]tricosa-1,3,5,7,10,15,18,20,22-nonaene-12,14-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C51H30N4O2
assistant