You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[2,6-di(propan-2-yl)phenyl]-4-[1-[2,6-di(propan-2-yl)phenyl]-3-methyl-2-(1-methylpyridin-1-ium-2-yl)indol-4-yl]-3-methyl-2-(1-methylpyridin-1-ium-2-yl)indole by IUPAC nomenclature, provide its molecular formula.
user
C54H60N4+2
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