You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-(2,6-difluoroanilino)-1-oxopropan-2-yl] 2-(4-fluorophenoxy)-2-methylpropanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18F3NO4
assistant