You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[3-(4-chlorophenyl)-1,2,4-oxadiazol-5-yl]methylsulfanyl]-N-(3,5-dimethoxyphenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H18ClN3O4S
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