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 7-chloro-6-fluoro-1-(4-fluoro-2-methylphenyl)-3-(2-methyl-6-oxo-1H-pyridin-3-yl)-2H-pyrido[2,3-d]pyrimidin-4-one ?
user
C20H15ClF2N4O2
assistant