You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-[(R)-[4-(3-chlorophenyl)piperazin-1-yl]-(4-nitrophenyl)methyl]-2-methyl-[1,3]thiazolo[3,2-b][1,2,4]triazol-6-ol by IUPAC nomenclature, provide its molecular formula.
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C22H21ClN6O3S
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