You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-(8-azabicyclo[3.2.1]octan-3-yl)-N-(2,2-dimethyl-1-phenylpropyl)acetamide;hydrochloride by IUPAC nomenclature, provide its molecular formula.
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C20H31ClN2O
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