You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (4-fluorophenyl) N-[(3R,7S,8aS)-3-benzyl-1,4-dioxo-2,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazin-7-yl]carbamate is given. What is its corresponding molecular formula?
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C21H20FN3O4
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