You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,4-dichlorophenoxy)-N-methyl-N-[[3-(3-methylphenyl)-1,2,4-oxadiazol-5-yl]methyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H17Cl2N3O3
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