You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 5-fluoro-7-(8-fluoro-2-methylimidazo[1,2-a]pyridin-6-yl)-3-(1-methylpiperidin-4-yl)-2H-quinazoline ?
user
C22H23F2N5
assistant