You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-chloro-5-[[5-chloro-4-[(1,2,2,6,6-pentamethylpiperidin-4-yl)amino]pyrimidin-2-yl]amino]benzonitrile .
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C21H26Cl2N6
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