You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(4-chlorophenyl)-9-[3-[9-(4-chlorophenyl)-1,10-phenanthrolin-2-yl]phenyl]-1,10-phenanthroline is the IUPAC name of a molecule. Please give its molecular formula.
user
C42H24Cl2N4
assistant