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 (8,8-dimethyl-8-azoniabicyclo[3.2.1]octan-3-yl) N-[(4-bromophenyl)methyl]-N-thiophen-3-ylcarbamate;bromide is given. What is its corresponding molecular formula?
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C21H26Br2N2O2S
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