You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3,4-dichlorophenyl)-5-fluoro-2-[(1S)-1-(7H-purin-6-ylamino)propyl]quinazolin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H16Cl2FN7O
assistant