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