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 1-[3-(8-azabicyclo[3.2.1]octan-3-yl)-5-[2-(5-chlorothiophen-2-yl)ethyl]pyrazol-1-yl]-2,2-dimethylpropan-1-one is given. What is its corresponding molecular formula?
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C21H28ClN3OS
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