You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3R,7S,8aS)-7-[(2-fluorophenyl)methylamino]-3-[(1S)-1-hydroxyethyl]-2,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazine-1,4-dione .
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C16H20FN3O3
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