You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2,4-dimethylphenyl)-[2-(4-fluorophenyl)-8-methylimidazo[1,2-a]pyridin-3-yl]diazene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H19FN4
assistant