You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[2-[4-cyclopropyl-3-(4-fluorophenyl)-5-oxo-1,2,4-triazol-1-yl]ethyl]-2-(trifluoromethyl)benzamide .
user
C21H18F4N4O2
assistant