You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-[4-[1-(2-cyano-1-cyclopentylethyl)pyrazol-4-yl]pyrrolo[1,2-b]pyridazin-3-yl]formamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H20N6O
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