You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 9-[2-[3-(2-carbazol-9-ium-9-ylideneethyl)-5-[4-(3-diphenylphosphorylprop-1-enyl)phenyl]phenyl]ethenyl]carbazole .
user
C55H42N2OP+
assistant