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 9'-[4-[4-(2,5-diphenylpyrrol-1-yl)phenyl]phenyl]spiro[1,9a-dihydrofluorene-9,19'-9,11-diazapentacyclo[10.7.0.02,10.03,8.013,18]nonadeca-1(12),2(10),3,5,7,13,15,17-octaene] .
user
C57H39N3
assistant