You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-butan-2-yl-2-[(4-chlorophenyl)methyl-[2-(3-methyl-N-(4-methylphenyl)sulfonylanilino)acetyl]amino]butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H38ClN3O4S
assistant