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-[4-(3-hydroxy-3-methylbutyl)benzoyl]-3-(1H-imidazol-5-ylmethyl)piperazin-2-one is given. What is its corresponding molecular formula?
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C20H26N4O3
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