You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,4-dichloro-N-[2-[methyl-[(4-oxo-3H-quinazolin-2-yl)methyl]amino]-2-oxoethyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H16Cl2N4O3
assistant