You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-tert-butyl-2-(2-fluoro-3-phenylphenyl)-6-(trifluoromethyl)imidazo[1,2-a]pyridin-4-ium by IUPAC nomenclature, provide its molecular formula.
user
C24H21F4N2+
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