You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-[(2S)-butan-2-yl]-2-[[2-(3,4-dichloro-N-methylsulfonylanilino)acetyl]-[(3-methylphenyl)methyl]amino]butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H33Cl2N3O4S
assistant