You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-oxo-2-(4-oxo-3H-quinazolin-2-yl)-3-(4-piperidin-1-ylsulfonylphenyl)propanenitrile into its molecular formula.
user
C22H20N4O4S
assistant