You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-methoxy-N-[3-oxo-3-[1-[4-(1,2,4-triazol-1-yl)phenyl]ethylamino]propyl]benzamide into its molecular formula.
user
C21H23N5O3
assistant