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 [(3aR,6aS)-3a-chloro-3-oxo-2-[(1R)-1-phenylethyl]-1,4,5,6-tetrahydrocyclopenta[c]pyrrol-6a-yl] 2,2-dimethylpropanoate is given. What is its corresponding molecular formula?
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C20H26ClNO3
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