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system
Name the molecular formula for the molecule established as 1-[(4aS,9aS)-4a,5-dimethyl-2,3,4,6,7,8,9,9a-octahydropyrido[3,2-b]azepin-1-yl]-2-(2-methoxy-4-methylphenoxy)ethanone using the IUPAC nomenclature.
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C21H32N2O3
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