You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N'-[2-(5-chloro-4-methoxy-2-methylphenyl)-7-piperazin-1-ylimidazo[1,2-a]pyrimidin-6-yl]ethane-1,2-diamine into its molecular formula.
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C20H26ClN7O
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