You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[3-chloro-4-(difluoromethoxy)anilino]-2-oxoethyl] 2-(6-methyl-1-benzofuran-3-yl)acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H16ClF2NO5
assistant