You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 2-(2-chlorophenyl)-2-[1-(2-chlorophenyl)-3-methyl-2,5-dioxoimidazolidin-4-ylidene]acetamide into molecular formula.
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C18H13Cl2N3O3
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