You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-ethyl-3-(morpholin-4-ylmethyl)-N-[(3-thiophen-2-yl-1,2,4-oxadiazol-5-yl)methyl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N4O3S
assistant