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 (2R,3R,4R,5R)-2-[4-(2-bromo-4-fluoroanilino)-6-methoxyquinazolin-7-yl]oxy-5-fluorohexane-1,3,4,6-tetrol;hydrate is given. What is its corresponding molecular formula?
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C21H24BrF2N3O7
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