You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 4-chloro-3-[5,7-difluoro-4-oxo-6-(1,2,3,6-tetrahydropyridin-4-yl)-1H-quinolin-2-yl]benzonitrile ?
user
C21H14ClF2N3O
assistant