You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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5-[4-[2-(2,4-dichlorophenyl)-5-formyl-4-methylpyrazol-3-yl]phenyl]pent-4-ynenitrile is the IUPAC name of a molecule. Please give its molecular formula.
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C22H15Cl2N3O
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