You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[4-(4-chlorophenyl)-5-pyridin-3-yl-1,2,4-triazol-3-yl]sulfanyl]-N-cyclohexylacetamide into its molecular formula.
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C21H22ClN5OS
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