You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N,N-bis[4-(2-phenylethynyl)phenyl]-4-[(E)-2-[4-[(E)-2-[4-[4-(2-phenylethynyl)-N-[4-(2-phenylethynyl)phenyl]anilino]phenyl]ethenyl]phenyl]ethenyl]aniline by IUPAC nomenclature, provide its molecular formula.
user
C78H52N2
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