You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 5-[(3-chlorophenyl)diazenyl]-2-hydroxy-4-methyl-6-oxo-1-prop-2-enylpyridine-3-carbonitrile into its molecular formula.
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C16H13ClN4O2
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