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 2-[4-[[4-chloro-3-[4-(5-fluoropyridin-2-yl)piperazine-1-carbonyl]phenyl]methyl]piperazin-1-yl]benzonitrile .
user
C28H28ClFN6O
assistant