You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[2-[2-(diethylamino)ethoxy]phenyl]-3-[3-(furan-2-yl)-1,2,4-oxadiazol-5-yl]propanamide into its molecular formula.
user
C21H26N4O4
assistant