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-[1-[[6-amino-5-[2-(5-fluoropyridin-2-yl)ethynyl]pyrimidin-4-yl]amino]ethyl]-8-fluoro-5-methyl-3-phenylquinazolin-4-one is given. What is its corresponding molecular formula?
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C28H21F2N7O
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