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-[(3S)-3-(6-methoxypyridazin-3-yl)oxypyrrolidine-1-carbonyl]-1-methylpyrrolidin-2-one is given. What is its corresponding molecular formula?
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C15H20N4O4
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