You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-[3-(3-methoxyphenyl)-4-oxoquinazolin-2-yl]sulfanyl-N-(propylcarbamoyl)acetamide is given. What is its corresponding molecular formula?
user
C21H22N4O4S
assistant