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Name the molecular formula for the molecule established as (4aS,8aR)-N-(3-chloro-4-fluorophenyl)-3,4,4a,5,6,7,8,8a-octahydro-2H-quinoxaline-1-carboxamide;hydrochloride using the IUPAC nomenclature.
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C15H20Cl2FN3O
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