You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[(4-bromophenyl)methyl-[2-[(2,6-dichlorophenyl)methylsulfanyl]acetyl]amino]-N-tert-butylpropanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H27BrCl2N2O2S
assistant