You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-(4-fluoroanilino)-1-oxobutan-2-yl] 2-[(1,1-dioxo-1,2-benzothiazol-3-ylidene)amino]propanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20FN3O5S
assistant