You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-methyl-11,11-dioxo-N-piperidin-4-yl-5,6-dihydrobenzo[b][1]benzothiepine-2-sulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N2O4S2
assistant