You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-(4-chlorophenyl)-3-[1-(3,4-dichlorophenyl)cyclobutyl]-5,6-dihydro-2H-imidazo[1,2-b][1,2,4]thiadiazole;hydrobromide by IUPAC nomenclature, provide its molecular formula.
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C20H19BrCl3N3S
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