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 (4R)-4-(3,4-dimethoxyphenyl)-6-(3-propan-2-yloxypropyl)-1,3,4,7-tetrahydropyrrolo[3,4-d]pyrimidine-2,5-dione is given. What is its corresponding molecular formula?
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C20H27N3O5
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