You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 1-[(2S)-1-oxo-1-[4-(trifluoromethyl)anilino]propan-2-yl]piperidine-4-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23F3N2O3
assistant