You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-chloro-4-[2-[1-(3-fluoro-4-methoxyphenyl)-2,5-dimethylimidazol-4-yl]ethynyl]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H15ClFN3O
assistant