You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(Z)-1-(4-acetamidophenyl)ethylideneamino]-2-(3,5-dimethyl-N-methylsulfonylanilino)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26N4O4S
assistant