You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-bromo-3-[(E)-2-[2-[(1-ethylpyrazol-4-yl)amino]pyrimidin-5-yl]ethenyl]-2-fluoro-5-methoxy-N-methylbenzamide .
user
C20H20BrFN6O2
assistant