You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[4-(4-phenylphenyl)phenyl]-14-(4-phenylquinazolin-2-yl)-9,14-diazapentacyclo[11.7.0.02,10.03,8.015,20]icosa-1(13),2(10),3,5,7,11,15,17,19-nonaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C50H32N4
assistant