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Convert the IUPAC name of a molecule 7-[5-[[(1S,2S,3R)-2-fluoro-8-azabicyclo[3.2.1]octan-3-yl]-methylamino]pyrazin-2-yl]-3-methyl-5H-imidazo[1,2-b]pyridazin-8-one into molecular formula.
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C19H22FN7O
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