You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-(6-oxo-4,5-dihydro-1H-pyridazin-3-yl)-N-prop-2-enyl-N-(pyridin-4-ylmethyl)propanamide into its molecular formula.
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C16H20N4O2
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