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 5-(3-bromophenyl)-1,3-dimethyl-6-phenacylpyrrolo[3,4-d]pyrimidine-2,4-dione is given. What is its corresponding molecular formula?
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C22H18BrN3O3
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