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 2,3-dihydropyrido[4,3-b][1,4]oxazin-4-yl-[1-(pyrrolidine-1-carbonyl)piperidin-3-yl]methanone is given. What is its corresponding molecular formula?
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C18H24N4O3
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