You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-oxo-N-[1-(pyridine-2-carbonyl)piperidin-4-yl]-4,5-dihydro-1H-pyridazine-3-carboxamide into molecular formula.
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C16H19N5O3
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