You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 3-[2-chloro-4-(3-ethoxy-3-oxopropanoyl)-3,6-difluorophenoxy]azetidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H22ClF2NO6
assistant