You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[ethyl(2,2,2-trifluoroethyl)amino]ethyl]-3-[3-(4-methoxyphenyl)-1,2,4-oxadiazol-5-yl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23F3N4O3
assistant