You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-(2-methyl-4-nitrophenyl)-2-[4-[2-nitro-4-(trifluoromethyl)phenyl]piperazin-1-yl]acetamide into molecular formula.
user
C20H20F3N5O5
assistant