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 tert-butyl (3aS,6S,6aS)-6-[(4-bromophenyl)methyl]-6a-hydroxy-1-methyl-2-oxo-3,4,5,6-tetrahydrocyclopenta[b]pyrrole-3a-carboxylate is given. What is its corresponding molecular formula?
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C20H26BrNO4
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