You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (Z)-3-(4-amino-2,2,6,6-tetramethylpiperidin-1-yl)-N-(5-chloro-2-methoxyphenyl)-2-cyanoprop-2-enamide into its molecular formula.
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C20H27ClN4O2
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