You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 7-[4-(cyanomethylamino)-5-[1-[(2R)-2-fluoro-3-hydroxy-3-methylbutyl]triazol-4-yl]pyridin-2-yl]pyrrolo[1,2-b]pyridazine-3-carbonitrile into its molecular formula.
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C22H20FN9O
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