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 1-acridin-3-yl-3-[[2-(3-methylphenyl)-6-(trifluoromethyl)pyridin-3-yl]methyl]urea is given. What is its corresponding molecular formula?
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C28H21F3N4O
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