You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(4-fluoroanilino)-2-oxoethyl] 2-butan-2-yl-1,3-dioxoisoindole-5-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H19FN2O5
assistant