You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(1-azabicyclo[3.3.1]nonan-4-yl)-2-(5-methoxy-1-methylindol-3-yl)-2-oxoacetamide;hydrochloride into its molecular formula.
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C20H26ClN3O3
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