You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2,9-bis[4-(2,6-diphenylpyrimidin-4-yl)phenyl]benzimidazolo[2,1-b][1,3]benzoxazole;2,9-bis[4-(2,6-diphenylpyrimidin-4-yl)phenyl]-5-phenylbenzimidazolo[1,2-a]benzimidazole .
user
C177H113N19O2
assistant