You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1R)-1-hydroxyethyl] (3S,4S)-3-[3-(4-fluorophenoxy)-4-methoxyphenyl]-4-methylpyrrolidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24FNO5
assistant