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 2-[[4-(3-chloro-2-fluoroanilino)-7-methoxyquinazolin-6-yl]methyl-methylamino]-3-methoxypropanamide is given. What is its corresponding molecular formula?
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C21H23ClFN5O3
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