You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 3-[1-(6-chloro-2-methylpyridin-3-yl)oxy-3-methylbutyl]pyrrolidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H31ClN2O3
assistant