You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-(5-chloropyridin-2-yl)-2-(6-fluoro-4-oxoquinazolin-3-yl)-3-(3-fluoropyridin-2-yl)propanamide .
user
C21H14ClF2N5O2
assistant