You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-[2-[4-(difluoromethoxy)phenyl]ethylamino]-2-oxoethyl] 2-[(4-bromobenzoyl)amino]acetate into its molecular formula.
user
C20H19BrF2N2O5
assistant