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-[4-[6-[2-(4-bromo-2,6-difluorophenyl)ethylamino]pyrimidin-4-yl]-2-ethoxyphenyl]formamide .
user
C21H19BrF2N4O2
assistant