You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-(6,7-dimethoxyquinazolin-4-yl)oxy-2,6-difluorophenyl]-N-(3-fluoro-4-morpholin-4-ylphenyl)-2-oxoacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H23F3N4O6
assistant