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 2-[6-bromo-2-[2-(4-chlorophenyl)ethyl]-1H-indol-3-yl]-N-methylacetamide is given. What is its corresponding molecular formula?
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C19H18BrClN2O
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