You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-(5-chloro-1-hydroxyisoindol-2-yl)-N-(4-piperazin-1-ylpyridin-3-yl)-1,3-thiazole-4-carboxamide into its molecular formula.
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C21H19ClN6O2S
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