You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-butan-2-yl-2-[(3,4-dichlorophenyl)methyl-[2-[(4-nitrophenyl)methylsulfanyl]acetyl]amino]propanamide ?
user
C23H27Cl2N3O4S
assistant