You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3-chlorophenyl)methyl]-2-[3-(2-fluorophenyl)-4-oxoquinazolin-2-yl]sulfanylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H17ClFN3O2S
assistant