You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-(3-fluoro-4-methylphenyl)-4-(6-fluoro-4-oxoquinazolin-3-yl)piperidine-1-carboxamide is given. What is its corresponding molecular formula?
user
C21H20F2N4O2
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