You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-chloro-N-(3,5-dichloro-4-naphthalen-2-ylsulfanylphenyl)imidazo[2,1-b][1,3]thiazole-5-sulfonamide is given. What is its corresponding molecular formula?
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C21H12Cl3N3O2S3
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