You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[[2-[N-(benzenesulfonyl)-2,5-dichloroanilino]acetyl]-[(2,6-dichlorophenyl)methyl]amino]-N-butylpropanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H29Cl4N3O4S
assistant