You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[2-(diethylamino)ethyl]-N-(1,1-dioxothiolan-3-yl)-2-(6-methoxy-1-benzofuran-3-yl)acetamide is given. What is its corresponding molecular formula?
user
C21H30N2O5S
assistant