You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[(3,4-difluorophenyl)methyl]-6-[3-(trifluoromethyl)pyridin-2-yl]oxyquinazolin-4-one into its molecular formula.
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C21H12F5N3O2
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