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 5-amino-1-cyclopropyl-6-fluoro-8-methyl-7-[6-(methylamino)-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]pyrrol-4-yl]-4-oxoquinoline-3-carboxylic acid is given. What is its corresponding molecular formula?
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C21H25FN4O4
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