You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 5-nitro-4-[1-[2-[4-(trifluoromethyl)phenyl]acetyl]piperidin-4-yl]-1,3-dihydroquinoxalin-2-one ?
user
C22H21F3N4O4
assistant