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-[3,5-bis(trifluoromethyl)phenyl]-2-(4-methylpiperazin-1-yl)-2-(3-methylpyridin-2-yl)acetohydrazide .
user
C21H23F6N5O
assistant