You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[(2,4-dichlorophenyl)methyl-[2-(4-ethyl-N-methylsulfonylanilino)acetyl]amino]-N-ethylbutanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H31Cl2N3O4S
assistant