You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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2-[2-[3-(3-chlorophenyl)-1,2,4-oxadiazol-5-yl]pyrrol-1-yl]-N-(2,6-dimethylphenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
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C22H19ClN4O2
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