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 1,3-dimethyl-2-(12-methyl-11-pentacyclo[11.7.0.02,10.03,8.015,20]icosa-1,3,5,7,10,12,15,17,19-nonaenyl)benzimidazol-3-ium .
user
C30H25N2+
assistant