You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(4-butylphenyl)-N-[4-[4-(N-(4-butylphenyl)-4-ethylanilino)phenyl]phenyl]-4-ethylaniline;ethane by IUPAC nomenclature, provide its molecular formula.
user
C52H64N2
assistant