You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[3-[5-amino-3,6-dimethyl-6-(trifluoromethyl)-2H-1,4-oxazin-3-yl]-4-fluorophenyl]-5-(2-methoxyethoxy)pyrazine-2-carboxamide .
user
C21H23F4N5O4
assistant