You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-phenyl-N-[4-(5-phenyl-1,3,4-oxadiazol-3-ium-2-yl)phenyl]-N-(2-phenylphenyl)carbazol-3-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C44H31N4O+
assistant