You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 4,7-bis[5-(4-hexylphenyl)thiophen-2-yl]-1,3-dimethyl-2-(5-phenylthiophen-2-yl)benzimidazol-3-ium ?
user
C51H53N2S3+
assistant