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 (3aS,7aS)-4-[(2-fluorophenyl)methyl]-3a-methyl-1-(1-methylpyrazole-4-carbonyl)-3,6,7,7a-tetrahydro-2H-pyrrolo[3,2-b]pyridin-5-one is given. What is its corresponding molecular formula?
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C20H23FN4O2
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