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-[2-(tert-butylamino)-2-oxoethyl]piperazin-4-ium-1-yl]-2-oxoethyl]-2-fluoro-4-methoxy-N-methylbenzamide .
user
C21H32FN4O4+
assistant