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 3-tert-butyl-1-(cyclopropylmethyl)-1-[[1-[(3,4-dichlorophenyl)methyl]imidazol-2-yl]methyl]urea into molecular formula.
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C20H26Cl2N4O
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