You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[2-amino-5-fluoro-4,5-dimethyl-6-(trifluoromethyl)-6H-1,3-oxazin-4-yl]-4-fluorophenyl]-5-cyanopyridine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H16F5N5O2
assistant