You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-(3-butan-2-yl-2,4-difluorobenzene-6-id-1-yl)pyridine;iridium;pyridine-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
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C21H19F2IrN2O2-
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