You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2R)-2-[4-(3-chloro-2-methyl-N-methylsulfonylanilino)butanoyl-[(4-methylphenyl)methyl]amino]-N-(2-methylpropyl)butanamide .
user
C28H40ClN3O4S
assistant