You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (2S)-2-[[2-[N-(benzenesulfonyl)-2-ethylanilino]acetyl]-[(2-methylphenyl)methyl]amino]-N-butylpropanamide using the IUPAC nomenclature.
user
C31H39N3O4S
assistant