You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-oxo-2-(spiro[1,3-benzodioxole-2,1'-cyclopentane]-5-ylamino)ethyl] 4-fluorobenzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18FNO5
assistant