You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-chlorophenyl)-2-[3-[(4-chlorophenyl)methyl]-2,4-dioxoquinazolin-1-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H17Cl2N3O3
assistant