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 (1'S,2R,4'R)-7'-(pyridine-4-carbonyl)spiro[1,3-dihydroquinazoline-2,2'-7-azabicyclo[2.2.1]heptane]-4-one is given. What is its corresponding molecular formula?
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C19H18N4O2
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