You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 9-[4-(1-amino-2-methylpropan-2-yl)phenyl]-6-bromo-8-hydroxy-5,5a,6,7,8,9,9a,9b-octahydro-3aH-thieno[2,3-c]quinolin-4-one into molecular formula.
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C21H27BrN2O2S
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