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 4-[(5S,9R)-1-acetyl-7-benzyl-3-(3,5-dichlorophenyl)-2,4-dioxo-1,3,7-triazaspiro[4.4]nonan-9-yl]benzonitrile is given. What is its corresponding molecular formula?
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C28H22Cl2N4O3
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