You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-chloro-N-[1-[[3-methyl-2-(4-methylpiperidin-1-yl)butyl]amino]-1-oxopropan-2-yl]benzamide into its molecular formula.
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C21H32ClN3O2
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