You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (6-bromo-1,2-benzothiazol-3-yl)-[(1R,5R)-3-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-3,8-diazabicyclo[3.2.1]octan-8-yl]methanone by IUPAC nomenclature, provide its molecular formula.
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C20H17BrN6OS
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