You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3,4,4a,5,6,7,8,8a-octahydro-2H-quinolin-1-yl(2,3,4,5-tetrahydro-1H-3-benzazepin-7-yl)methanone into its molecular formula.
user
C20H28N2O
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