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-[7-bromo-6-chloro-2-[2-(dimethylamino)ethyl]-8-fluoroquinazolin-4-yl]-2-tert-butylpiperazine-1-carboxylic acid is given. What is its corresponding molecular formula?
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C21H28BrClFN5O2
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