You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-(3,4-dichlorophenyl)-1-[2-[(3,4-dichlorophenyl)carbamoylamino]ethyl]-1-(2-hydroxyethyl)urea is given. What is its corresponding molecular formula?
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C18H18Cl4N4O3
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