You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 9-[9-[4-tert-butyl-5-(4-tert-butylphenyl)pyridin-2-yl]-2-[3-[3-(3,5-ditert-butylphenyl)-2H-benzimidazol-1-yl]phenoxy]carbazol-4-yl]-1,2,3,4,5,6,7,8-octadeuteriocarbazole by IUPAC nomenclature, provide its molecular formula.
user
C70H69N5O
assistant