You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-methyl-2-nitrophenyl)-2-(4-oxo-3-prop-2-enylquinazolin-2-yl)sulfanylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18N4O4S
assistant